Somewhat migrating to Mountain Lion

I currently have Lion installed, which is an upgrade over Snow Leopard. My iMac is a Summer 2010 Intel. The HDD in this system is 1TB. I'm currently using up about 450GB.
I want to upgrade to Mountain Lion, but I don't want to do it the regular way because I have too much old stuff on here that I don't want, but I still want to pick and choose the things I want to keep.
So what I was thinking is this:
Cutting the main partition in half. 500/500. Installing Mountain Lion fresh onto the blank partition, and then from within that partition running, mount the old Lion partition, and copy selectively the stuff that I want over. Music, some Applications, and whatever else I want.
When that would be all set and done, and I definitely don't need the Lion partition anymore, I was wondering this:
(The question)
Can I delete the Lion partition, and basicallyl absorb the free space into the Mountain Lion partition. I would like to have it so that it works just like I installed ML onto the main partition to begin with.
The only thing I ask on top of that, is that since I'm a little OCD... it would bug me if the partition numbering would be off by one. For example, I know that the main partition is 0, and it would unfortunately bug me if after all this was completed, that the main partition would for some reason be labeled as 1.
It wouldn't stop me though if the numbering was off, would simply bug me a litte. A small price to pay for being able to do the thing I ask.
Thanks for any help everyone!
(In case some people are wondering what kind of things I don't want following over, would be any old settings, old files, fluff from old applications, and worst of all ... some weird font problem where I somehow have thousands of fonts installed [that I honestly don't know where they came from] that I want gone, but can't manage to get it to reset the fonts ... even when I use the Font Books font reset thing)

Is there some sort of work around since you say "Not directly?"
How about if I split it 500 (0 = old) and 500 (1= new) were to copy over whatever I wanted to keep from 0 to 1, format 0, clone 1 to 0, then erase 1 and absort the free space into 0?
This should theoretically work, and fix potential problems with the numbering I mentioned above ( ). The only question then that I think remains, is can I clone 1 to 0, and have it still able to boot up like regular? I know I can select start up discs, so maybe this would?
Either way, if I needed to take the extremely long way around, I could split them, install on 1 (to get it working), from 1 copy all my stuff, erase 0 and install ML, from 0 copy stuff from 1 ( :/ ) and then erase 1 and absorb it into 0. (Right? Would this work? I can't imagine it wouldn't...)

Similar Messages

IMac CPU3.06 GHz Intel Core 2 Duo, 8GB, Extremely slow and repeatedly "out of Memory" since migration from Mountain Lion to Mavericks

Dear Apple Support Community.
As mentioned by a number of users reporting the same problem, my 2009 iMac CPU3.06 GHz Intel Core 2 Duo, 8GB RAM, has become extremely slow and repeatedly "out of Memory" since it was migrated from Mountain Lion to Mavericks (OS 10.9 then OS 10.9.1).
I have already run CleanMyMac, deleted 5GB of useless stuffs, which did not translate into any improvement. Following the advices collected in other Apple Support Community threads, I have applied EtreCheck the outcome of which is provided below.
For information, I have also upgraded my 2011 MacBook CPU2.3 GHz Core i7, 8GB which became only a bit slower than before, sometimes freezing which it almost never did before. However, I am used to the fact that Mac get usually slower and more prompt fo freeze after upgrading to a more recent OS.
Both my 2009 iMac and my 2011 MacBook have F-Secure installed. So the problem with the 2009 IMac is unlikly to be due to the presence of F-Secure. Interestingly, the few abnormalities found by Etrecheck were exacly identical before I ran CleanMyMac. There are two more findings (mentioned below) since I ran CleanMyMac on the 2009 iMac, which again didn't improve the problem.
So please find below the details of the EtreCheck experience and some additional measurements made with iStat while running EtreCheck:
Hardware Information:
iMac (24-inch, Early 2009)
iMac - model: iMac9,1
1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
8 GB RAM
Video Information:
ATI Radeon HD 4850 - VRAM: 512 MB
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 1.9 - SDK 10.9
AppleAVBAudio: Version: 2.0.0 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
System Software:
OS X 10.9.1 (13B42) - Uptime: 0 days 2:40:57
Disk Information:
WDC WD1001FALS-40K1B0 disk0 : (1 TB)
EFI (disk0s1) <not mounted>: 209.7 MB
XooS5 HD (disk0s2) /: 999.35 GB (189.85 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
OPTIARC DVD RW AD-5670S
USB Information:
Apple Inc. Built-in iSight
Canon CanoScan
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
FireWire Information:
WD My Passport 071D 800mbit - 800mbit max
EFI (disk1s1) <not mounted>: 209.7 MB
disk1s2 (disk1s2) <not mounted>: 2 TB
Boot OS X (disk1s3) <not mounted>: 134.2 MB
Thunderbolt Information:
Kernel Extensions:
com.f-secure.kext.fsauth          (1.0.0d1)
Problem System Launch Daemons:
[failed] com.apple.wdhelper.plist [REMARK: this abnormality appeared only after running CleanMyMac. It does not appear on my 2011 MacBook]
Problem System Launch Agents:
Launch Daemons:
[loaded] com.adobe.fpsaud.plist
[invalid] com.bjango.istatlocaldaemon.plist [REMARK: this abnormality pre-existed to running CleanMyMac. It appears also on my 2011 MacBook]
[loaded] com.f-secure.fsavd.dbhelper.plist
[loaded] com.f-secure.fsavd.plist
[loaded] com.f-secure.fsmac.firewall.plist
[loaded] com.f-secure.fsmac.fsupdated_guts2.plist
[loaded] com.f-secure.fsmac.licensetool.plist
[loaded] com.macpaw.CleanMyMac2.Agent.plist
Launch Agents:
[loaded] com.babylon.activation.plist
[loaded] com.bjango.istatlocal.plist
[loaded] com.f-secure.relauncher.plist
[loaded] com.f-secure.trasher.plist
User Launch Agents:
[loaded] com.adobe.ARM.[...].plist
[loaded] com.google.keystone.agent.plist
[loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist
[loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist
[loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist
User Login Items:
iTunesHelper
Dropbox
F-Secure Anti-Virus for MAC
3rd Party Preference Panes:
Flash Player
Internet Plug-ins::
FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6
Default Browser: Version: 537 - SDK 10.9
AdobePDFViewerNPAPI: Version: 11.0.04 - SDK 10.6
AdobePDFViewer: Version: 11.0.04 - SDK 10.6
DivXBrowserPlugin: Version: 2.1
Flash Player: Version: 11.9.900.170 - SDK 10.6
OfficeLiveBrowserPlugin: Version: 12.2.8
Google Earth Web Plug-in: Version: 6.1
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0
User Internet Plug-ins::
Picasa: Version: 1.0
Bad Fonts:
None
Old applications:
None
Time Machine:
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
XooS5 HD: Disk size: 930.71 GB Disk used: 753.90 GB
Destinations:
XooS5 TM [Local] (Last used)
Total size: 2
Total number of backups: 32
Oldest backup: 2013-09-15 01:11:39 +0000
Last backup: 2013-12-07 12:48:45 +0000
Size of backup disk: Too small. Backup size 2 < (Disk used 753.90 GB X 3)
Time Machine details may not be accurate. All volumes being backed up may not be listed.
REMARK: The above finding is unlikely to be accurate. In fact, my Time Machine is supported by a 2TB WD My Passport Studio external HD connected with a Firewire 800. As mentionned, only 754GB of the 2000GB are used.
Top Processes by CPU:
5%          backupd
5%          Mail
5%          WindowServer
3%          Finder
3%          Dropbox
Top Processes by Memory:
1.60 GB          mds_stores REMARK: this item was marked in red in the outcome of EtreCheck, so I assume there is something wrong there
82 MB          Finder
74 MB          Mail
49 MB          softwareupdated
49 MB          Dropbox
Virtual Memory Statistics:
97 MB          Free RAM
1.21 GB          Active RAM
1.19 GB          Inactive RAM
1.21 GB          Wired RAM
1.83 GB          Page-ins
36 MB          Page-outs
Please find now some additional measurements collected with iStat while running EtreCheck:
Practically:
The iMac can work slowly with only one software e.g. either Mail or Safari or Firefox, but still the below "out of Memory" message occurs about every 3 minutes.
Aperture has becomre to slow to be useable
If trying to write a mail (with Mail) while Safari or Firefox is open, then the "out of Memory" message occurs about every 20 seconds so I need to check on "Resume" several times per minute.
Conclusions
From the above, unless anyone in the Apple Support Community proves to be able to identify a specific problem leading to a way to find a cure, I tend to conclude that Mavericks is not suitable for computers operating with a Core 2 Duo CPU even with a 8GB of RAM.
Unless I missed something, I did not see any warning from Apple Computer Inc. informing their customers they should refrain from upgrading Core 2 Duo Computers.
The only solution I see so far is to downgrade from Mavericks to Mountain Lion. And the Apple Support Community would confirm that it is the only solution, I would appreciate to get your guidance on how to proceed.
Intended action plan
Migrate the above 2009 iMac to a 2014 Mac Mini Server operating on Mavericks to ensure that no data may be lost while downgrading to Montain Lion.
Provided the above downgrading operation is successful, assign this 2009 iMac to partial retirement e.g. Mail, Skype, iTunes and DVD player.
In advance, I would like to thank the Apple Community for helping me either i) finding a cure to the problem, ii) or confirming that Mavericks cannot operate properly on Core 2 Duo computers, iii) and in such a case, guiding me on how to downgrade to Mountain Lion.
Yours sincerely
Core

... what anti-virus would you recommend using?
Use what is already included with OS X. It already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple.
A much better question is "how should I protect my Mac":
Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required.
Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email:
Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.
Such "phishing" attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it.
Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it. If your iTunes or App Store account becomes disabled for valid reasons, you will know when you try to buy something or log in to this support site, and are unable to.
Don’t install browser extensions unless you understand their purpose. Go to the Safari menu > Preferences > Extensions. If you see any extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone.
Don’t install Java unless you are certain that you need it:
Java, a non-Apple product, is a potential vector for malware. If you are required to use Java, be mindful of that possibility.
Disable Java in Safari > Preferences > Security.
Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
Popup windows are useful and required for some websites, but popups have devolved to become a common means to deliver targeted advertising that you probably do not want.
Popups themselves cannot infect your Mac, but many contain resource-hungry code that will slow down Internet browsing.
If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
If you elect to use "anti-virus" software, familiarize yourself with its limitations and potential to cause adverse effects, and apply the principle immediately preceding this one.
Most such utilities will only slow down and destabilize your Mac while they look for viruses that do not exist, conveying no benefit whatsoever - other than to make you "feel good" about security, when you should actually be exercising sound judgment, derived from accurate knowledge, based on verifiable facts.
Do install updates from Apple as they become available. No one knows more about Macs and how to protect them than the company that builds them.
Summary: Use common sense and caution when you use your Mac, just like you would in any social context. There is no product, utility, or magic talisman that can protect you from all the evils of mankind.

Time machine backup is very slow after migration to Mountain Lion

After I migrated to mountain lion, Time machine backup is very slow. Time machine preference says there is no previous back up although I had Time machine on before migration. It did not help verymuch to connect an ethernet cable between my timecapsule and my Macbook Pro
Here are the screenshots I see:
Should I erase the previous backup made on Lion before backing up on Mountain lion? in this case how do I transfer the Lion backup file on another disk just in case something goes wrong before I have a good backup under Mountain Lion? just like any other file?

After further reading on the forum, the problem was solved: I used the possibility to back up on a second disk (in the preferences Time Machine choose a disk and save on both disks) to make a back up on another usb disk, and then erased the old .sparsebundle file on my Time Capsule. I have then re defined time capsule as the back up disk and then the backup was muuuuuch faster (one night instead of less than 1 giga after 3 days.....)

Can't Subscribe to Google Calendars after Migration to Mountain Lion

I had my work Google canendars synciing fine with iCal on my old desktop running Lion. After migrating to a new Mac Book with Mountain Lion, I cannot subscribe to my gCal's. The error I get is "Server With Secure Communication Unavalable", which makes no sence.
I've tried:
Chosing to use the calendar when adding the gMail account to Mail.app
Enabling the Calendar under the "Mail, Contacts & Calendars" Preference pane
Adding the account using Calendar.app's Preferences.
The suggestions I've been able to find don't apply, because we are not using Google's two-step validation.
Did Mountain Lion break something with the Google-Apps flavor of gCal? Is there a way to add via URL? I tried that using Safari, but it did not work well (created a iCloud Calendar, wouldn't allow me to change the assigned color and repeatedly threw an error for the same over a year-old event despite clicking the "Ignore" button).
Ray

Found a work-around. I don't know if this applies to all Google calendars, or just the Google-Apps ones:
Add the calendar as a generic CalDAV calendar. Use your full (hosted) gMail address as the username and www.google.com as the server address.
Interrestingly, ML matched this up to the main Google account in the "Mail, Contacts & Calendars" Preference Pane
Ray

Manual Migration to Mountain Lion: but can't see the home library folder.

Hi,
This is my first post in the Apple support community.
I'm moving from iMac running Snow Leopard to my MacBook Pro retina running Mountain Lion.
I only want to move what I really need, and leave all the old software and old files behind.
I put the MacBook Pro in target disc mode and started moving things through a FireWire 800 cable, connected to a Thunderbolt port through an Apple adapter.
Until I came to the items in the home library folder to move - and, of course - I couldn't see the home library folder on my retina MacBook Pro.
The key question is: can I make it visible for the time of the move?
Should I put the old iMac in target disc mode and handle the move from the retina Macbook Pro side and unhide the library folder using the Command + Shift + G keystroke?
Or are the days of manual migration over due to the hidden home library folder?
Applecare support noted I should use the migration assistant, and that I could chose the files I wanted to move.
Can you really do it in such a detail as during a manual migration?
Thanks!

Choose Go to Folder from the Finder's Go menu and provide ~/Library/ as the path.
(73480)

Migrate from Mountain Lion to Snow Leopard without transferring the OS?

I am leaving my job and need to transfer all of my files from my work computer back to my personal computer. My work computer is Mountain Lion and my personal computer is Snow Leopard. I need to know how to use Time Machine/Migration Assistant to move all of my files. (I was going to just update my personal MBP to Mountain Lion but the hardware is not supported for that OS.)
How can I get all of my files off of a computer with Mountain Lion, to put onto a computer with Snow Leopard?
MOVING FROM:
15" MBP 6,2 (Mid 2010)
Mountain Lion OS X 10.8.2
500GB SATA HD
8GB memory (max)
2.66 GHz Intel Core i7
MOVING TO:
17" MBP 2,1 (Late 2006)
Snow Leopard OS X 10.6.8
500GB SATA HD
3 GB memory (max)
2.33 GHz Intel Core 2 Duo
...What are my options???

Welcome to Apple Support Communities
You can't use Migration Assistant to transfer the data from a computer with Mountain Lion to a Mac with Snow Leopard.
In this case, the only thing you can do is to transfer the data manually with an external disk. Just get an external disk, put the data you need onto the external disk and finally, transfer the files to your home computer.
Unfortunately, this is the only way to do it. If you want, you can use Carbon Copy Cloner to make a clone on an external disk if you don't want to copy your data manually to the external disk

Password problem after migrating to Mountain Lion Server

Hello everyone,
Yesterday, I migrated our Lion Server to Mountain Lion Server. Everything seemed to work fine. Except since this morning, none of the network user cannot connect to their calendar, reminders, and wiki. They can connect to their account and to their mails. The following line appears multiple times in ApplePasswordServer.Error.log:
Aug 16 2012 16:52:50 700250us client response doesn't match what we generated
It seems that only web services are concerned (vpn, mobile accounts, and mails are working). My initial guess is that the hash computed on the basis of the user password is not computed on the same way on the client machine (which is running Mountain Lion by the way) and on the server. On the other hand, this would be very surprising, since all this stuff is based on standards and unlikely to have changed since Lion.
I tried to create a new "Test" user. Even this new user, created after the migration, cannot connect to its calendar, etc. I also tried to reset my user password using the Server App. It makes no difference, the same lines appear in the logs.
Is anyone experiencing a similar problem ? Does anyone have a clue of what to try next ?
Thanks a lot !

I found out the following:
After looking at the contents of the password server database using the slot numbers of several user accounts, it seems that all users where WEBDAV-DIGEST authentication is failing, have two entries for the digest method "*cmusaslsecretDIGEST". This is obviously wrong. All users who can authenticate successfully have only one such entry.
Deleting and recreating the user account has no effect. In fact, updating the password server with a new entry may actually trigger this error. It could be that all users where this is failing have changed their passwords after the server was updated to Mountain Lion.
It would be interesting to know if you also see duplicate entries for "*cmusaslsecretDIGEST" in the database. You can display a password server record via the user account's slot number (in your example, the 0xd6ace...) using the command
sudo mkpassdb -dump <slot-number>
At the end of the record dump, you should see 10 digest entries with their method identifiers.

Migrate the mountain lion upgrade the snow leopard personal items

this is my question

If you install Mt. Lion over Snow Leopard, your data will not be changed. Is that your query?
Regardless, a backup is useful to have at all times.
Ciao.

Problems while migrating to Mail 6 - Mountain Lion

Is there a way ro recover lost mails while migrating to Mountain Lion ? And why did I loose all the mails in the first place ?
After the upgrade to Mountain Lion, on July 27, I started Mail and I could read or retreive mails from 2 different POP accounts (Bluewin/Swisscom and Skynet/Belgacom). I checked the configuration of the 2 POP accounts and I used the tool provided by Swisscom i.e. SwisscomEmailRepair to no avail. All mail accounts on my Mac had, without any warning whatsoever, disappeared (including InBox and Sent items) ...
Gmail and me.com mail accounts were reset without any problem. I have been struggling with the 2 POP a/c. I checked with the Swisscom guys about their tool and they confirmed that it only modified "Servers, User name and password".
It seems that I am not the only one with problems... any good advice is welcome :-)

Finally, I found a solution.:-)
When creating a mail account for Swisscom for example, you have no choice to the type of account. You get automatically an IMAP one. By forcing the Mac wizzard to build the account manually, by entering dummy info, I managed to reconfigure my mails in the way I wanted. However, It didn't work right away. Before creating manually the accounts, I suppressed all of them in the system preference. I took out all the login info in the key chain and then restarted the Mac.

Problem with Admin access to downloaded apps in Mountain Lion

I am using a full admin account on my MacBook, running Mountain Lion Version 10.8.2.
I have downloaded 2 applications and installed them.
When I try to open the applications, I keep getting the following message:
Cannot install required resources.
Your user account doesn't have sufficient access privileges. You will need to run this game once from an administrator account. Afterwards, you will be able to run it from this account.
What I do not understand is that I AM doing this from a full administrator account. ALL of the profiles I have on my laptop are full Admin accounts.
What am I missing?

Thanks. I really appreciate your help.
Unfortunately, after doing both, neither action solved it.
I am seriously beginning to regret migrating to Mountain Lion. Should have stuck with Snow Leopard...

Mountain Lion feature preferences not working

Ever since Mountain Lion was released some of the new features preference panes wont open for me. Every time I try to open one, my Settings app just freezes and I have to force quit it. Things that wont open: Security & Privacy and adding Twitter and Facebook accounts. My Messages app doesnt even work, I can send and recieve but nothing shows up in the app. I've been looking online and trying many different things (removing preferneces, adding preferences from another account where they work) and I have a test account where everything works. Any other things I could try?
EDIT: I forgot to add that my AppStore freezes everytime I open it too. I can view the Updates Tab but if I click anything else it freezes.

Hi,
IF you have another computer you can transfer things like an whole Users account to your Mac or in some cases you can transfer the whole thing, Applications, And Users normally.
There can be issues with this as some Applications may not work in a newer OS
Some Preferences (what is kept in the .plists in the User's Library/Preferences) may not work properly with newer version of the apps they go with.
For example iChat in Lion has been replaced by Messages and iChat 6 should not be installed /Transfered/Migrated to Mountain Lion
Repair Permissions is done with the Disk Utility in the Applications/Utilities folder.
I am not sure the Disk Utility is accessible on a Restore Boot (CMD+ R)
This could be really simple such as the Contacts app > My Card (Head And Shoulders icon) not being set to your details and App like Messages that make use of the info can't read it.
On the other hand it could be a lot deeper than than and you may need to Restore the whole OS (CMD + R on Start up)
9:08 PM Monday; November 5, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Mountain lion performances

Hello,
I migrated to Mountain Lion last week-end. I had a big performances problems. New Safari takes much more time to open pages. Iphoto taks more time to start. From time to time I had a message "votre disque de démarrage Mac OS X ne dispose plus d'espace disponible pour la mémoire allouée aux applications". What to do? I'm thinking about downgrading to initial operating system. It is risky isn't it? How to isolate a performance problem and to resolve it?
Thanks for your help
GAGA0412

Your problem is excessive swapping of data between physical memory and virtual memory.
That can happen for two reasons:
You have a long-running process with a memory leak (i.e., a bug), or
You don't have enough memory installed for your usage pattern.
Tracking down a memory leak can be difficult, and it may come down to a process of elimination. In Activity Monitor, select All Processes from the menu in the toolbar, if not already selected. Click the heading of the Real Mem column in the process table twice to sort the table with the highest value at the top. If you don't see that column, select
View ▹ Columns ▹ Real Memory
from the menu bar.
If one process (excluding "kernel_task") is using much more memory than all the others, that could be an indication of a leak. A better indication would be a process that continually grabs more and more memory over time without ever releasing it.
If you don't have an obvious memory leak, your options are to install more memory (if possible) or to run fewer programs simultaneously.
The next suggestion is only for users familiar with the shell. For a more precise, but potentially misleading, test, run the following command:
sudo leaks -nocontext -nostacks process | grep total
where process is the name of a process you suspect of leaking memory. Almost every process will leak some memory; the question is how much, and especially how much the leak increases with time. I can’t be more specific. See the leaks(1) man page and the Apple developer documentation for details:
Memory Usage Performance Guidelines: About the Virtual Memory System

Lion's Time Machine backup crashes Mountain Lion

I have a OS X Lion's Time Machine backup with a few user accounts. Now I need to restore one user account and its data to a MacBook Pro with a replaced hard drive installed with OS X Lion and nothing else. I was told by Apple guys to:
1) upgrade to Mountain Lion first;
2) connect the OS X Lion Time Machine backup, then run the Migration Assistant (Mountain Lion).
The first time I did it, I migrated everything to the MacBook Pro. Then the user accounts and home folders all mixed up. The Lion's applications replaced Mountain Lion's applications of the same names, so and so... Problems gradually surface in two days, that I spent. The Mountain Lion crashed and the MacBook Pro had to reinstall the OS X Lion, then repeat 1) and 2) above.
The second time I did it, I told Apple of my experience, and they told me to uncheck everything else except the user account I wanted to migrate. Then after doing 1) above, and at 2) above, I found that nothing could be unchecked. I told Apple, and they told me to go ahead. After migrated everything, including Applications and the user accounts and data, The Mountain Lion crashed in many native applications, again. (Long story cuts short!)
Now, the thrid time, after wasting my week's time. Apple still tells me to upgrade to Mountain Lion before recovering the user from the TM backup drive. And I have again spent 6 hours in such things as wiping out everything (I guess Apple used Disk Utility to create 1-partition, quickest), install OS X Lion, and I installed Mountain Lion (less than 2 hours inlcuding download and install), then manually "copy" the one user account needed from the last completed (not the "Latest" and not the one with .InProgress) Time Machine dated backup/Machintosh HD/Users to the new INTERNAL Machintosh HD/Users. (The current logged-on account is "test" which is different from the one I need to migrate.)
What next? I shall create a new user account and assign the migrated user as the home folder of the new user account. Does it work? I don't know.
Why not simply restore the user account and data from OS X Lion's Migration Assistant, then upgrade to Mountain Lion? Why?
What about other applications? (e.g. Microsoft Office for Mac 2011), native iPhoto, iTunes....?)
Scenario: If my Time Machine backup was started a year or 2 years ago from Snow Leopard or Lion, and all the way to Mountain Lion. Then one day the drive crashes. Can Time Machine / Migration Assistant give me a one-click-done restoration? Or I need to go through this teasing process again?
Is Time Machine serving its purpose? (Who's purpose? Increase Apple's sales? or Recovering everything for the Mac user with a crashed drive?)

Try the following:
Restore Lion to your HDD. During setup, use setup-assistant to restore your data from TM-Backup.
When this is done upgrade to ML.

Dual boot, Mountain Lion and Mavericks and Migration Assistant

Hi all,
I have a Macbook Pro Retina which cam with Mountain Lion installed, and I want to upgrade to Mavericks. However, I have a need to run some apps in Mountain Lion, as official support for those apps will not go past 10.8.5 (Avid's Pro Tools 10) and I need to be able to open archived projects.
I also wish to clean install both operating systems fresh, and do a stripped ML partition, with bare bones essentials, on the smallest partion possible. Mavericks will be the main system, and ML won't host user data, only the legacy apps. I am fine with erasing my 500GB SSD.
My current process is to install ML from the recovery partition, and use disk utility to partition before I do, then install Mavericks from a bootable USB (already made).
So my questions are these:
For ML:
1. What size partition is the minimum necessary to install ML, plus the apps and run without hitch? The legacy apps will take maybe 4GB.I want this as small as possible.
2. When I do a fresh install of ML, what apps can safely be deleted without affecting the system?
For Mavericks:
When migrating my old user account to Mavericks, I don't wish to migrate the apps, just the user settings and the data. I will make an entire backup of the user directory on a separate drive before I start this process, as well as a Time Machine backup. I then plan to migrate the account settings and data, but manually reinstall the extra apps. The reason for this is I have a lot of third party apps, and some are trials I decided to uninstall, and they all leave junk behind.
3. If I import the user account settings and data only, what cruft or orphaned files should I be aware of?
4. Are there options to cherry pick the settings that are migrated?
5. If I manually copy, for example, the mail folder, iCal or messages folder in my user library, and place it into the appropriate user folder in the new account in a worst case scenario, will there be any drama I should be aware of?
Lastly, a question of Apple ID's/iCloud:
6. Before doing this process, should I deauthorise my iTunes account, or will that be fine when migrated anyway?
7. What will happen with my iPhone when I sync to a fresh install on mavericks, will it attempt to wipe my iPhone, or is that part of the user data that is migrated?
Thank you for your time and patience reading this!

ML
1. I'd go with at least 40 because you need some extra disk space for the computer to work properly. You can install that one partition, load it, and see how much disk space is used and adjust as required. Also boot from it and make sure it runs okay.
2. Everything but the Apple applications, which you probably won't be able to delete.
Mavericks
Almost all applications are stored in the hard drive level Applications folder. Check your user applications folder and if there are no applications, just copy the entire user folder.
3. Hard to answer. In theory, none.
4/5. They may not work due to differences between 10.8 and 10.9. You might want to consider using Setup Assistant and restore from Time Machine. Then delete the stuff you don't want.
6. Shouldn't matter - same computer. I have 2 partitions and both are authorized for iTunes and the App Store.
7. If you restore from Time Machine, you should be okay.

I am trying to transfer files from my PowerBook G4 (OSX 10.4.11) to my new iMac (Mountain Lion). Migration assistant tells me I need to upgrade migration assistant on the G4, but I can't find a download that will work for anything older than OSX 10.5.

Yes, my PowerBook G4 is still trucking along. It is running OSX 10.4.11, but I just bought a new iMac that is running Mountain Lion. I just tried to use Migration Assistant. It told me to update Migration Assistant on the G4, but I can't find an update for anything earlier than 10.5. Is there a way to get my files transfered, or am I going to need to update the OS on my computer I was getting ready to retire?
Thanks!

You never know, someone might remember. What happens in detail when you try to use it, and HOW are you trying to use it?

Somewhat migrating to Mountain Lion

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