How to Schedule Time Machine!

Hello Everyone,
I love time machine. Just wondering, how to I schedule a time and day to backup onto my external hard drive?
Thanks,
19kash88

Homeboy wrote:
...subsequent backup files should be smaller but mines has been about 10-12 gig and I haven't added anything new to the computer?
Maybe you haven't added anything new, but how about some app? For example, Outlook's email file can be huge and stores all emails together. It adds one new email and the whole file is backed up again. Same thing for the data file of Parallels or other VM OSes. Any large database program that uses one file for the data will do that too. It could be any number of things.

Similar Messages

How to transfer time machine back up to new hard drive

How to transfer time machine back up to new hard drive?

You may like to take a look at this thread... https://discussions.apple.com/thread/4207670?start=0&tstart=0

How to stop Time Machine from backing up Temp Files?

Hi folks!
I am trying to find out how to stop Time Machine from constantly backing up 'useless' temporary files accumulated from web browsing? Although I don't change or add large files to my HD, Time Machine backs up hundreds of MBs every hour. Those file amounts make sense when I consider that I browse a lot to YouTube, SoundCloud, etc to watch videos or listen to music - I just don't want them to be backed up.
Under Time Machine Options I already excluded the following items from backups:
~/Library/Caches
/Library/Caches
~/Downloads
But even though I did this weeks ago, Time Machine stills finds large files to be backed up every hour and my only guess is that I am still missing a location where either Safari or Firefox - the two web browsers I use - store temporary files.
Can you help?
Thanks a lot in advance!

oas2103 wrote:
they come from my anti-virus software
Are you sure you need that? There are no viruses that run on OSX. None. Zip. Zero.
If you're running Windoze on your Mac, that's the same as running it on a PC, so it needs all the same anti-everything stuff you'd use on a PC.
There is some "malware," such as Trojans, for Macs, though. But (unlike viruses that can get onto your system without your knowledge), you must approve their installation (via your Admin password) and/or operation (via the "This application was downloaded from the internet ..." prompt).
Appropriately enough, some of these Trojans are included in pirated versions of Apple software, such as iWork!
For the gory details, see Thomas Reed's [Mac Virus Guide|http://www.reedcorner.net/thomas/guides/macvirus].
Thanks a lot again!
You're quite welcome, and thanks for posting back.

My time machine backup external hard drive has failed. I have a newer external drive already connected to my MAC but can't figure out how to get Time Machine to set up on it?

My time machine backup external hard drive has failed. I have a newer external drive already connected to my MAC but can't figure out how to get Time Machine to set up on it

http://pondini.org/TM/21.html

HT201405 how to solve time machine error-1

how to solve time machine error-1

I checked the pondini fixes and ended up doing the following - in case this could help someone else with OSX Lion and Time Capsule... http://pondini.org/TM/Troubleshooting.html
First, I downloaded and used Airport Utility 5.6 instead of 6.1 - BTW, I had to attempt download and installation THREE times before the program actually installed. Be persistant.
Pondini #5: It's possible some names (of all things!) may be a problem. See item C9. I had to re-name my Mac, Time Capsule, network, etc... to remove all apostrophes and spaces.
Pondini #7: If you have WD SmartWare installed on Lion, it's not compatible, per RoaringApps, and there are reports it can cause this problem as well. Use Western Digital's uninstaller, or delete the app from /Applications and the files com.wdc.WDDMservice.plist and com.wdc.WDSmartWareServer.plist from /Library/LaunchDaemons. There may also be a file in Library/Application Support.
I then had to shut down computer, unplug Time Capsule, unplug modem; plug everything in again, then reboot computer; then had to go to Apple- System Preferences- Network- and reselect my Time Capsule to connect to WiFi again.
Then opened Time Machine preferences again and attempted back up - it worked!

How does the time machine work

how does the time machine work....I need to find an older version of a document...

Hi mogburn,
Time Machine is part of the System software, not a feature of the word processing and page layout application, Pages, the topic in this community.
That said, Time Machine is pretty easy to get into.
In the Finder, open the folder containing the current version of the file.
Select the file, then click on the Time Machine icon in the menu bar and choose Enter Time machine.
The folder window will move to the center of the screen, and two arrows will appear near the lower right corner of the window.
Click the one pointing back to go back in time, and the one pointing toward the front (of the computer) to return to the present. The display will stop at each saved version of the file along the way.
Need more details? Try asking in the Mac OS X v10.6 Snow Leopard community.
Regards,
Barry

How to use time machine to back up

how to use time machine to back up files

Welcome to the Apple Support Communities
See > http://support.apple.com/kb/ht1427
To set up Time Machine, open System Preferences > Time Machine > Select Disk, and choose the external disk you want to use to make the backups. Time Machine will start making its first backup just after selecting your external drive.
If you have more questions about Time Machine, see this website > http://pondini.org

What size Time Capsule - i.e. how big are Time Machine Backups

Hi all,
Just trying to decide which Time Capsule to get...my question is basically how big are Time Machine backups.
For example I have a MacBook with 100gb harddrive. At the moment about 80gb in use.
I assume the Time Capsule will immediately backup that 80gb but how big are the incremental backups. If I modify about a GB's worth of data each day, does this GB get moved to the capsule or is Time Machine cleverer than this and only backups the changes at byte level for example.
Any pointers, thoughts, etc. much appreciated.
Michael.

I have an iMac with a 500GB hard drive and a MacBook with an 80GB hard drive. The MacBook is nearing capacity but the iMac has around 90GB of data (the Time Machine backup is around 93GB). I will likely opt for the 1TB version as I am eligable for a Government discount bringing the cost down to £303 (£183 for the 500GB version). As it's unlikely that it will be easy to upgrade the Time Capsule HDD then I'm looking at future proofing as I do not want to have to repurchase in a few years. I'm also likely to buying a second MacBook or MacBook Pro in the coming months so it does make sense.
Secondly, you can use the Time Capsule as a shared storage area as well as for the Time Machine function.

How do I schedule Time Machine

Is there a native way (built into MacOS) to control my time machine activites? Darn thing seems to backup whenever I really need some horsepower. I would prefer that it backup overnight.
Thanks!

mleeber wrote:
Is there a native way (built into MacOS) to control my time machine activites?
No, and the 3rd-party apps that provide alternate scheduling are not recommended. See Time Machine - Frequently Asked Question #13.
Darn thing seems to backup whenever I really need some horsepower.
As noted in the pink box there, most likely there's something else wrong -- backing-up less frequently is just treating the symptom, not the cause.

How to make Time Machine only back up once per day?

I really really don't need time machine to back up EVERY HOUR. It's overkill for me and with the level of computing I am forcing my computer to do most of the day its VERY irritating. Is there anyway to change the settings so it only backs up once every night?

Yeah, we tried using TimeMachineEditor on a friend's laptop. There will be 2 laptops backing up, and we wanted them both to backup overnight at different times when there would be no interruptions (for user or computer). It seemed to work OK (have to check w/ them), but how do you verify when backups were actually done?
I have a couple related question to this, though, that may also be helpful for folks:
- I'm guessing Time Machine cannot do a backup when the computer is asleep, correct? If a Time Machine backup starts while the computer is 'awake', will it keep the computer from sleeping so it can finish?
- If I set a schedule in the Energy Saver preferences to 'Wake Up' the computer at midnight (before scheduled backup), and 'Sleep' later on (say 4am), does this override the other preferences set for sleep in Energy Saver? (ie - if it's set to sleep after 30min., will the computer wake up at midnight only to go back to sleep 30min. later, or will it stay 'awake' until 4am?)
- Do you need to uncheck 'Put the hard drive to sleep when possible'?

How to restore time machine from wireless hard drive?

I backed up my data to a wireless hard drive before I wiped my hard drive. But now I'm having trouble restoring it.
Can't restore it from time machine, as it was not fully complete.
Migration assistant asks for a password to the hard drive, which I don't know. The person in my family who bought the drive entered it, but then migration asssistant greys out continue and nothing seems to happen
I opened the hard drive myself and there's a bunch of blank files named 01 349 049 984 and such. No extension.
Help?

The exhaustive list of backup devices supported by Time Machine consists of Time Capsule and locally connected and mounted volumes, period. Time Machine can use NAS devices, but there are many caveats including but not limited to the necessity for AFP to be running on the server. Wireless storage devices introduce yet another element of uncertainty.
OS X Mountain Lion: Disks you can use with Time Machine
Anything else, and you're a test pilot. Let Apple know how it works for you.

How long for Time Machine backup with USB v. 1

My hard drive might be failing. I'm going to backup with Time Machine for
the first time ever. I'll be using a 1 TB external hard drive. My Mac only
has a USB v. 1, so how long should this take? I read where someone said
that Time Machine said it would take DAYS to do it. Say it ain't so!! Any
ideas our there? Thanks!

See this for an indication of transfer rates these are theoretical speeds - real world is slower!
http://en.wikipedia.org/wiki/List_of_device_bit_rates
USB 1.1 runs about 1.5MB/s at full rate.
How much data is on your internal disk?
Wolfram Alpha says 1TB would take 7 days & 17 hours.
http://www.wolframalpha.com/input/?i=1TB+at+1.5+MB%2Fs
I would add more days to that time to account for the fact that USB 1 is slower (more like 0.7MB/s in my tests from years ago).
This is an appalling idea - your disk could easily stop working in the time it takes to copy.
Fortunately you have got the spec wrong on this iMac…
http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.4-20-inch-alu minum-early-2008-penryn-specs.html
It has USB2 ports & Firewire - connect directly to one of those & the time will be much less (more like 1/2 a day).

Concerns ALL Time Machine Users. HOW TO MOVE Time Machine backups. Help !

Concerns ALL Time Machine Users :
MOVE (or COPY) Time Machine backups from a "x"To Disk to an "y"To greater disk.
Hello and thank you all for reading me,
First, excuse me if I make language errors (I'm French).
Secundo, I don't know if you'll find something interesting for you
in what I write about Time Machine and my own problems,
but there's a possibility also that YOU could perhaps help me.
I'm talking about Time Machine and his **** Backups.backupdb folder,
containing "*Name of your Mac*" folder,
this folder containing Time Machine backups, format : YYYY-MM-DD-HHMMSS
Time Machine doesn't recognize the backups it made *IF YOU MOVE THEM*.
I have perhaps a solution in this message.
You'll see below what kind of problem I (and you could) have.
Since 12/01/10, an Apple Adviser Level Two (and me)
are trying to understand how to move backups from TM1To Disk to, let's say, a bigger one.
My case is TM1,5To.
*Purpose :* Move 19 backups from Time Machine X disk to Time Machine Y disk.
Delete TMX disk Time Machine backups after that.
Make TMY disk the current used Time Machine Disk.
I don't remember exactly what we did before
(we even created a "root" account with password (dangerous to do),
but it didn't solve the problem),
but we finally copied :
TM1To > Backups.backupdb > *MacBook Pro* folder (containing 19 backups) into :
TM1,5To > Backups.backupdb folder.
The Copy application announced *16 hours !* (without antivirus, to remove absolutely).
So I said goodbye and thank you to my Apple Adviser. After *8 hours*, Copy failed.
BUT it had succeeded to copy *4 backups ONLY* (why ?) in TM1,5To.
I immediately verified and checked each of these with Get Info.
They had EXACTLY the same size (Byte to Byte) as in TM1To.
➔ BUT HERE IS MY OBSERVATION :
After designing TM1,5To as Time Machine Disk, I ordered it to Backup (now).
And what did Time Machine do in TM1,5To > Backups.backupdb ?
It created a *NEW folder*, named *MacBook Pro 2* !
➔ *I HAVE NO ACCESS* to TM1,5To > Backups.backupdb > *MacBook Pro* (4 backups copied from TM1To, remember) ;
➔ while I still *HAVE ACCESS* to TM1To > Backups.backupdb > *MacBook Pro* (19 backups) ;
➔ *AND I HAVE ACCESS* to TM1,5To > Backups.backupdb > *MacBook Pro 2*,
where Time Machine makes actually his backups.
*NOTE :* If you *change the name* of your computer,
Time Machine *changes automatically the name* of the folder who is in Backups.backupdb folder.
➔ ① I have *never seen* such protections (Sharing and Permissions).
You are not allowed to do anything. I've tried to change permissions,
first : "R+W", after that : "Make (Me) the owner", I can tell you : DON'T DO IT !
➔ ② It's impossible to install an OS on a Time Machine disk
(I thought it would allow better permissions).
OS Installer detects the existence of a Backups.backupdb folder
and refuses to install on this disk or partition.
I have now the bad intent to install minimal OS X
1) after deleting (how ?) this folder (but not its contents, how to move it ?)
and 2) declare *after that* the disk as Time Machine disk.
➔ ③ Time Machine doesn't backup OTHER Time Machine backups
(who are in an ancient-not-choosed-for-backups Time Machine disk) NOR backups this disk
(detects, once again, the existence of a Backups.backupdb folder).
AND you can't *absolutely not remove backups from the folder the're in*
(for me, *MacBook Pro* or *MacBook Pro 2*).
➔ ④ I didn't have time to do it, but I think there would perhaps be a solution
in restoring backups in partitions specially created to receive them (having the same name,
that sort of thing) and then re-backup these partitions (vicious and complicated).
There is a function on Mac OS X Install DVD : start with it, and then (do not install)
choose "*restore from Time Machine backup*" from the menu bar (it's called "Utilities", I believe).
➔ ⑤ I *absolutely don't understand* what follows :
— If I add (in my TM1To disk) the bytes of the 19 backups
in Backups.backupdb > *MacBook Pro* folder, I obtain about *1,8 To*.
— It's impossible (and not french).
— When I check the size used with Disk Utility (NOT with Get Info),
I find a correct (?) size : *about 750 Go*.
— What are Time Machine backups made of ?
It can't be aliases (because of their size, and because *aliases suppose originals,
and where could they be ?*), or am I wrong and becoming crazy ?
➔ ⑥ If you refer to the numbers shown at the end of this text (*4 backups*),
you'll see I could *delete duplicate elements* inside these 4 backups,
to win space (but *what kind* of space *if I delete aliases* ?).
Back-In-Time (see below) says he does it.
BUT is it really the OLDEST items I have to destroy (see ⑤),
when I don't know with what kind of ARTEFACT I'm acting ?
What does Time Machine delete to create more backup space ?
Is it REALLY the OLDEST backups it treats, or duplicates, OR ?
*What you can do :*
Find and go to Tri-Edre.fr or Tri-Edre.com/fr site (it's a french company
that creates small Mac applications since fifteen years at least,
I think I already bought them several programs in 1990) ;
Their program *Back-In-Time 1.4.4* is free (Trial) and complete to download (with PDF docs too).
It is *ENTIRELY DEDICATED* to Time Machine and *things you can't do* with.
Price is about 30 €, I think it's worth.
The TRIAL version you will obtain can only work on the LAST Time Machine backup,
but you will see what's featured *AND :*
You will ACCESS to ANY Time Machine backup you want
(It has to be the last of a serie of backups, but the serie you want.
I've bought the application and own an activation key, but you understand I can't give it to you
(it would not be ethic) and anyway you would be obliged to disconnect AirPort, Ethernet etc.
•➔ I have bought the application because I thought (it's said in PDF FAQs) I could IN THE END move Time Machine backup files, but it cannot, (I'm afraid).
*BUT ANY ACCESS PROBLEM IS SOLVED.*
•➔ Back-In-Time 1.4.4 can *delete :* duplicate backups, complete backups,
or duplicate items inside one or several Time Machine backups,
things that I believe impossible with Time Machine itself
(I've seen it offers to delete ALL occurences of an item) ;
•➔ The application can also restore anything you want, where you want
(but I think Time Machine does it too ?)
•➔ Believe it or not, but since I've bought it on 15/01,
I've only worked about 2 hours (no, much more) on it
and didn't make sufficient progresses (enhancements ?)
to talk of it with sufficient experience (I'm a bad guy, don't you think ?)
•➔ Tri-Edre offers on-line support, e-mail support (and so on),
and I EVEN didn't manage to join them, because I did many other things,
and also somewhat have been disgusted *not to be able to move* or copy
*(accessible by Time Machine after that)* backups,
and I also didn't succeed (*another Time Machine inconvenient*) to DESTROY an ".inProgress"
Time Machine (package) which doesn't work anymore (several interruptions while active),
date (and name) 2010-01-27-164345.inProgress, but is used (*with failure results*)
by Time Machine (it's turned off till I find how to destroy its **** ".inProgress" package.
•➔ I've asked my Apple Adviser Level 2 to wait for news from me
before working himself on the problem, and I think I will send him this message
to prove I haven't forgotten him.
•➔ I'll send it to Tri-Edre too, in the same move.
I hope those remarks to be useful for somebody, tell me if it has helped.
I will also publish this in any Time Machine topics I find here, and in MacRumors site too.
As you can see, I need help too … Does anybody have an idea ?
Perhaps if I used a specific Copy software, it could work ?
You'll see below an example of some time I've spent to study my problem
(you will think I'm crazy).
With my kind regards, and good luck if you have other Time Machine problems !
Olivier Herrbach
<Edited by Host>
Le but du jeu est de transférer toutes les sauvegardes Time Machine
d'un volume/partition que nous appelerons "1 To"
sur un volume/partition que nous appelerons "1,5 To".
*Je rappelle que les 4 sauvegardes effectuées par Time Machine sur le 1 To
n'ont pas été reconnues comme siennes par Time Machine sur le 1,5 To,
bien que strictement identiques en taille après leur copie.
J'ai remarqué dans Back-In-Time des fichiers invisibles (tels que "TimeMachine.log"
ou quelque chose de genre), et je soupçonne fort qu'ils n'ont pas été copiés et que Time Machine,
ne les trouvant pas dans le 1,5 To, a ignoré à cause de leur absence les 4 sauvegardes décrites ici.*
*Sauvegardes effectuées par Time Machine sur 1 To :*
Path : MacBook Pro > Volumes > 1 To > Backups.backupdb > MacBook Pro
MacBook Pro contient 19 items (dont un alias appelé "Latest") :
1°) 2010-01-02-045758 Size : 913.207 B for 41.888 items comprenant :
• Hitachi 1 To Size : 907.664 B for 41.887 items 7 folders
Différence avec 1°) = - 5.543 B - 1 item (1 folder)
2°) 2010-01-03-001957 Size : 982.211.325 B for 67.490 items comprenant :
• Hitachi 1 To Size : 901.516 B for 41.886 items 6 folders
Différence avec 1°) = - 6.148 B - 1 item - 1 folder
• Samsung 500 Go Size : 981.302.510 B for 25.602 items 4 folders
Total • + • = Size : 982.204.026 B for 67.488 items
Différence avec 2°) = -7.209 B - 2 items (2 folders)
— *Supprimer • Hitachi 1 To* dans 2010-01-03-001957. Comparer les dossiers.
3°) 2010-01-04-222709 Size : 5.241.032.819 B for 26.509 items comprenant :
• Samsung 500 Go Size : 5.187.330.874 B for 19.392 items 8 folders
Différence avec 2°) = + 4.206.028.364 B - 6.210 items + 4 folders
• StartUp Disk Size : 53.692.703 B for 7.115 items 4 folders
Total • + • = Size : 5.241.023.577 B for 26.507 items
Différence avec 3°) = - 9.242 B - 2 items (2 folders)
— *Supprimer Samsung 500 Go* dans 2010-01-03-001957. Comparer les dossiers.
4°) 2010-01-05-125449 Size : 9.428.705.396 B for 204.915 items comprenant :
• HD 250 Go Size : 9.374.308.265 B for 181.575 items 7 folders
• Samsung 500 Go Size : 692.898 B for 16.222 items 8 folders
Différence avec 3°) = - 5.186.637.976 B - 3.170 items
• StartUp Disk Size : 53.692.703 B for 7.115 items 4 folders
Total • + • + • = Size : 9.428.693.866 B 204.912 items
Différence avec 4°) = - 11.530 B - 3 items (3 folders)
— Supprimer • StartUp Disk dans 2010-01-04-222709. IDENTIQUE.

Dear James Pond,
Thank you once again, and, don't be afraid, I will be as short as possible,
but I need to use your last reply (I've cut all what was already said).
JP ➔ You can copy an entire set of backups, but you cannot copy part of it successfully. See #18 etc.
JP ➔ Read this from the first paragraph: "you cannot copy only selected backups,
or merge two (or more) sets of backups." The structure of the backups simply will not allow it.
I've read it, and found it regrettable. And I've also read, after that, what were the solutions under Leopard and Snow Leopard, and my conclusion is that it's a *dead end* for me. In short,
— I can't move (by drag and drop) the 1To's Backups.backupdb folder (containing MacBook Pro, 19 backups, access) to 1,5To, because there exists already the Backups.backupdb folder created by copy on 12/01 with Apple Assistance (containing [MacBook Pro, 4 backups of 19, no access] and [MacBook Pro 2, 15 backups, access]). I don't even know if it could be deleted by the copy (and I don't wanna do that anyway) ;
— I can't rename (and what for, I already forgot it) any Backups.backupdb folder nor delete it ;
— I can't copy any Computer'sName folder (entire set containing backups), being in a Backups.backup.db folder, into another Backups.backupdb folder ;
— I can't copy any (or all of an entire set) YYYY-MM-DD-HHMMSS backup(s), being in a Computer'sName folder, into another Computer'sName folder (even if it would be empty).
— Saying NONE in Time Machine Preferences and putting it to OFF is simply no use.
All is said. What I can try to do is :
— Delete (not with Finder, but with Back-In-Time) all duplicate things I find in all backups and also entire duplicate backups (I have full access to all with the software) ;
— Restore each of the reduced-to-minimum backups obtained in specially right-sized partitions wearing the YYYY-MM-DD-HHMMSS name of each restored backup. Time Machine doesn't backup his backups, but will backup these partitions.
I'm afraid to be actually completely running out of the target, when I read what I write … It's time to go to bed !
Reminder (OH) : Where did you find these amazing informations ?
JP➔ Some of it is detailed here: http://www.appleinsider.com/articles/07/10/12/roadto_maco[]sx_leopard_timemachine.html
➤ Thank you ;
JP➔ and here:
http://arstechnica.com/apple/reviews/2007/10/mac-os-x-10-5.ars/14
➤ Thank you too ;
JP➔ You have to understand the structure. When TM does the first backup, yes, it copies everything.
On subsequent backups, it copies what's new or changed, but also makes "hard links" (sort of like aliases) to the copies of the things that didn't change. That's how it can only back up a few things each time, but show you a complete "snapshot" of the way your entire system looked at the time of every backup.
➤ I'll do my best to understand.
JP➔ Time Machine deletes backups under two conditions. See the first part of #12 in the Frequently Asked Questions User Tip, also at the top of this forum.
Under normal circumstances, you should not have to delete any backups. See the rest of #12.
➤ I understood why Time Machine didn't delete oldest backups : they were not weeklies ones.
Reminder (OH) : How can I destroy the (corrupted ?) not working "2010-01-27-164345.inProgress" in 1,5 To, which causes Time Machine to abort any backup of any size I ask ?
JP➔ Why do you think it's corrupted? TM is designed to "recover" a partial backup.
➤ I'll verify that with the little Tools/Apps I discovered in your FAQ User Tip document and downloaded immediately.
Why didn't Apple tell me anything ? It's my fault, I'm perhaps not clear and not demanding enough more from them.
JP➔ You cannot install OSX on a disk containing TM backups. That's because they need to be on separate disks.
Technically, you could put them on separate partitions of the same disk, but that would not be a good idea.
➤ I never told you that (there would be no interest at all). I talked about the same location, to see if it would allow me more permissions, but if all works without doing it, it's really no use.
JP➔ Sorry, I don't know what that means.
➤ I'm sorry, I didn't explain : "but if all works" meant : Copy Backups.backupdb, "without doing it" meant : Install OSX.
➤ If I install an OSX BEFORE, Time Machine will REFUSE completely to backup on it, it's understood.
JP➔ Correct. The partition you're running from will not be an option in TM Preferences > Select Disk. That prevents TM from backing-up it's own backups!
➤ Would it be so absurd ? Maybe it could resolve my actual problem ?
I think you are right, but I don't know why. I trust you.
Reminder (OH) : "I will not bore you again except if I don't find a specific answer to an unknown-never-seen-incredible malfuction."
JP➔ Don't worry about that -- thats what this forum is for, especially if you're still having problems.
➤ It's seems in fact that there is no possible solution, except what I said above and is certainly crazy/out of subject.
Just try to be as clear and concise as you can.
And please don't post the same things repeatedly -- it wastes your time and ours, and can confuse other folks.
➤ You're absolutely right and I tried to do so this time, and I'm sorry because I see it's still (far) not enough (short).
Thank you once more. I wish you a good evening and week-end. Here it's 01:40 AM.
With my kind regards
Olivier Herrbach
[email protected]

How to remove time machine backup from a mackbook pro used in target disk mode

Many months ago I (as my backup drive failed) I used my macbook pro in target disk mode to store the time machine backup of my iMac. How do I delete the backup on the macbook pro? I am running mountain lion on both machines. When I boot the macbook pro in target mode, it's not showing up in the finder on my mac.

When I boot the macbook pro in target mode, it's not showing up in the finder on my mac.
From the Finder menu bar, select
Finder > Preferences > General
and check the box marked Hard disks.

How to stop Time Machine backing up on a specific external hard drive?

I work on a iMac 2.66 Ghz Intel Core 2 Duo, with Mac OS X 10.6.8. I use two external hard drives that are the exact same model, 2 TB WD My Book 1110 Media: one is intended for back-up, the other for storing video editing files. They're both connected through USB 2.0.
I set the "back-up" hard drive as back-up disk for Time Machine, through the Time Machine preferences. Now, everytime I connect the "video" hard drive, Time Machine recognizes it as a back-up disk, and starts backing up on it. I could delete the "Backups.backupdb" file that Time Machine had created by connecting the "video" hard drive to another Mac and moving it to the Trash, but as soon as I reconnect the "video" hard drive to my iMac, Time Machine backs up on it again.
Is there a way to "de-select" a hard drive from Time Machine's list of back-up disks?
Note: I should mention another thing that might indicate a conflict. When both hard drives "back-up" and "video" are connected to my iMac, if I open Final Cut Pro X, I can only see my "back-up" hard drive. To access the files I am working on, I need to eject the "back-up" hard drive, and suddenly the "video" drive appears.
If you have any idea of how to solve this conflict... I am a bit lost.
Thank you!

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Give them unique volume names using Disk Utility.
Then set Time Machine back up to that unique volume name.
For example, I regularly use 4 external drives (though they're not all the same model).
The descriptions quickly tell me which drives I have connected to my MacBook when open Finder:
My Time Machine backup volume is named 'Time Machine 1TB'.
My iPhoto backup volume is named 'iPhoto Backup 320GB'
My iTunes backup volume is named 'iTunes Backup 120GB'
and the last is 'Windows 7 Backup 250Gb' but since it's a Windows volume, it is formatted NTFS.
This likely means that you will have to erase and repartition one of your drives to name it.
You MIGHT be able to rename it using Finder, right-clicking on the volume, and selecting Rename (current volume name).
WARNING: I can't be certain of what just renaming it that way could screw up in the way of permissions and file links.
Within Disk Utility, it seems it is absolutely not possible to change a volume name without clicking the Partition tab, and that involves erasing.
Given the choice, I'd probably choose to rename (erase and repartition) the Time Machine drive. A current backup or two on Time Machine, and I'm good. I don't really need to go 'way back' to recover files, because I really don't ever erase anything. I just keep buying bigger drives!
And I still burn the 'absolutely critical, priceless, can't ever be without this stuff' files to DVD or CD at least monthly or quarterly, in case one of my TM or backup drives fails at the same time as my primary hard drive. Call me paranoid, but I worked in Information Technology for many years: Murphy was an optimist!
Message was edited by: kostby

How to Schedule Time Machine!

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