Frequency of time machine backups

Is there a way to change the frequency at which the time machine backs-up? It backs up every hour and that is just too often. I have a 500GB Time Machine. Also, does anyone else's heat up to an insane degree? I have mine elevated for full ventilation and that helps exponentially.
-Thanks

Are they trustworthy?
I haven't used them myself, but I've heard good things about them.
They're reviewed here and here.
Good luck!
EDIT: I would use Time Machine Scheduler, since it doesn't mess with the system file TM uses to back up-it's probably safer.
Message was edited by: joshz

Similar Messages

Can i change frequency of time machine backups

I haven't used TM since my Time Capsule died last winter, i was waiting for new wifi AC TC. since then i purchased a new imac. now i'm deciding between the TC and the Airport Exteme. TC seem slike no brainer due to cheaper memories. the problem is tha tmy new imac is obviously only WiFi N. my last N mac took FOREVER to update my TC...it slowed my computer and seemed to eat my wifi. So ideally i'd love to get the AX unit and then a thunderbolt extermal drive. Altough i now realize the cost of the thurderbolt option on these drives...sweet lord! (Is the tech really that expense? apple controlling distribution to keep sales of TC?) . i probably could have avoided this if i had the patience to wait for an AC imac...but i don't have that much control!
So i figure the way around this would be to limit the backup. i really don't need hourly backups, not a work computer. Is there anyway to change the frequency of backups? daily or even weakly would be sweet for me. Thanks for any help in advance.

To change the frequency of Time Machine's backups, you would have to use a tool like Time Machine Editor; however, Time Machine only keeps hourly backups for the past day, and then daily backups for the past week, followed by weekly backups indefinitely. This means that it does exactly what you already want, with the added feature of hourly backups that are cycled through. As was mentioned above, in most cases these wont take much space at all, so adjusting Time Machine's behavior for the sake of saving space will not do much in the grand scheme of things.

How do I change the frequency of Time Machine backups?

Time Machine backs up far to often for me. I think it slows my computer down when it is backing up.
There must be a way to change the frequency

So far I have not seen Time Machine cause any slow down on my Macs nor have I seen it on any Mac for the users I help to support.
I suggest you download and install EtreCheck from http://etresoft.com/etrecheck
Run EtreCheck and publish report here
Allan

Time Machine backup frequency

Is there a way to modify the frequency of Time Machine backups without just turning it off for a period of time. I.E., can I tell TM to backup every 3 hours instead of every hour? Running Yosemite 10.10.1 on iMac (27-inch, Late 2013).

Yes:
TimeMachineEditor 4.0.2
iScheduleTimeMachine 1.5
Both work well.

How do I change backup frequency on time machine?

How do I change backup frequency for time machine?

You have met the infamous User Account Number issue, which causes denied access to previous user accounts.
A simple install creates a user account with a number, usually 501. If you use Setup Assistant at this point, to bring across your data from the previous OS, it will have the same number and access between the two is ok. If you wait and use Migration Assistant later, it creates a new user account, say with number 502. Now this account can't access the original data.
You can see this number in System Preferences>Users & Groups. Right click on your account name and go into Advanced Options. DON"T CHANGE ANYTHING.
Look at Pondini's guide for a second chance to use setup assistant...
http://pondini.org/OSX/Setup.html

Time Machine backup frequency and clean restore method

Just started using Time Machine on my late 2014 Mac Mini (Mac OS X 10.10.2) with an external drive (WD MyBook 3TB USB 3.0). Is there any way to change the Time Machine's backup frequency, let's say once a day or once a week instead of hourly?
Also, in the worst case scenario in which my Mac mini's hard disk fails to operate, how should I have a clean full restore on a new disk installed? Is my external bootable because of the Time Machine backups in it? And if not, do I use Mac App Store and install Mac OS X Yosemite on it? Further more is the an (automated) procedure to create a recovery start up disk for my system?

" Is there any way to change the Time Machine's backup frequency": No, but making a backup doesn't slow down at all
"is there an (automated) procedure to create a recovery start up disk for my system? That's one of the Time Machine features.
This FAQ will answer your other questions: Mac Basics: Time Machine backs up your Mac - Apple Support

I want a new and more powerful (non-Apple) wireless router but I still want to use my existing Time Capsule to continue with my Time Machine backups and I still need the Time Capsule's Network Attached Storage (NAS) features and capabilities

THE SHORTER STORY
My goal is to successfully use my existing Time Capsule (TC) with a new and more powerful wireless router. I need a new and more powerful wireless router in order to reach a distant Denon a/v receiver that is physically located in a master bedroom some 50 feet away from my modem. I need to provide this Denon a/v receiver with an Internet connection so that it can obtain its firmware updates and I need to connect this Denon a/v receiver to my network in order to use its AirPlay feature. I believe l still need the TC's Network Attached Storage (NAS) features because I am not sure if the new wireless router will provide me with the NAS like features / capabilities I need to share files between my two Apple laptops with OS X 10.8.2. And I know that I absolutely need my TC's seamless integration with Apple's Time Machine (TM) application in order to continue to make effortless backups of my two Apple laptops. To my knowledge nothing works with TM like Apple's TC. I also need the hard disk storage space built into the TC.
I cannot use a long wired Ethernet cable connection in this apartment and I cannot use power-line adapters. I have read that wireless range extenders and repeaters are difficult to successfully set-up and that they will reduce data speeds, especially so when incorrectly set-up. I cannot relocate my modem and/or primary base station wireless router.
In short, I want to use my TC with my new and more powerful wireless router. I need to stop using the TC to connect to the modem. However, I still need the TC for seamless TM backups. I also need to use the TC's built in hard drive for storage. And I may still need the TC's NAS capabilities to share files wirelessly between laptops because I am assuming the new wireless router will not provide NAS capabilities for OS X 10.8.2 (products like this/non-Apple products rarely seem to work with OS X 10.8.2/Macs to provide NAS features and capabilities). Finally, I want to continue to use my Apple laptop and AirPlay to wirelessly access and play my iTunes music collection stored on the TC's hard drive. I also want to continue to use my Apple laptop, AirPlay and Apple TV to wirelessly watch movies and TV shows stored on the additional external hard drive connected to the TC via USB. Can someone please advise on how to set-up my new Asus wireless router with my existing TC in such a way to accomplish all of this?
What is the best configuration or set-up to accomplish my above goals?
Thank you in advance for your assistance!!!
THE FULL STORY
I live in an apartment building where my existing Time Capsule (TC) is located in my living room and serves many purposes. Specially, my TC is at least all of the following:
(1) Wi-Fi router connected to Comcast Internet service via Motorola SB6121 cable modem - currently the TC is the Wi-Fi base station that connects to the modem and has the gateway address to the Internet. The TC now provides the DHCP service for the Wi-Fi network.
(2) Wireless router providing Internet and Wi-Fi network access to several Wi-Fi clients - two Apple laptop computers, an iPod touch, an iPad and an iPhone all connect wirelessly to the Internet via the TC.
(3) Wired Ethernet router providing Internet and Wi-Fi network access to three different devices - a Panasonic TV, LG Blu-Ray player and an Apple TV each use one of the three LAN ports on the back of the TC to gain access to the Internet.
(4) Primary base station in my attempt to extend my wireless network to a distant (located far away) Denon a/v receiver requiring a wired Ethernet connection - In addition to the TC, which is my primary base station, I am also using a second extended Wi-Fi base station (a Netgear branded product) to wirelessly extend my WiFi network to a Denon receiver located in the master bedroom and requiring a wired Ethernet connection. I cannot use a wired Ethernet connection to continuously travel from the living room to the master bedroom. The distance is too great as I cannot effectively hide the Ethernet cable in this apartment.
(5) Time Machine (TM) backup facilitator - I use my TC to wirelessly back-up two Apple laptops using Apple's Time Machine (TM) application. However, I ran out of storage space on my TC and therefore added external storage to it. Specifically, I added an external hard drive to my TC via the USB port on the back of the TC. I now use this added external hard drive connected to the TC via USB as the destination storage drive for my TM back-ups. I have partitioned the added external hard drive, and each of the several partitions all have enough storage space (e.g., each of the two partitions used by TM are sized at three times the hard drive space of each laptop, etc.). Everything works flawlessly.
(6) Network Attached Storage (NAS) - In addition to using the TC's Network Attached Storage (NAS) capabilities to wirelessly back-up two Apple laptops via TM, I also store other additional files on both (A) the hard drive built into the TC and (B) the additional external hard drive connected to the TC via USB (there are additional separate partitions on this drive for these other additional and non-TM backup files).
I use the TC's NAS feature with my Apple laptop and AirPlay to wirelessly access and play my iTunes music collection stored on the TC's hard drive. I also use my Apple laptop, AirPlay and Apple TV to wirelessly watch movies and TV shows stored on the additional external hard drive connected to the TC via USB. Again, everything works wirelessly and flawlessly. (Note: the Apple TV is connected to the network via Ethernet and a LAN port on the back of the TC).
The issue I am having is when I try to listen to music via Apple's AirPlay in the master bedroom. This master bedroom is located at a distance of two rooms away from the TC's current location in the living room, which is a distance of about 50 feet. This apartment has a long rectangular floor plan where each room is connected to the next in a straight line. In order to use AirPlay in the master bedroom I am using a second extended Wi-Fi base station (a Netgear branded product) to wirelessly extend my WiFi network to a Denon receiver located in the master bedroom and requiring a wired Ethernet connection. This additional base station connects wirelessly to the WiFi network provided by my TC and then gives my Denon receiver the wired Ethernet connection it needs to use AirPlay. I have tried moving my iTunes music directly onto my laptop's hard drive, and then I used AirPlay on this same laptop to connect to the Denon receiver. I always get a successful connection and the song plays, but the problem is that the connection inevitably drops.
I live in an apartment building and all of the many wireless routers in this building create a great deal of WiFi interference on both the 2.4 GHz and 5GHz bands. I have tried connecting the Netgear product to each the 2.4 and 5 GHz bands, but neither band can successfully maintain a wireless connection between the TC and the Netgear product. I also attempted to maintain a wireless connection to an iPod touch using the 2.4 GHz band and AirPlay on this iPod touch to play music on the Denon receiver. Again, I was able to establish a connection and successfully play music, but after a few minutes the connection dropped and the music stopped playing. I therefore have concluded that I have a poor wireless connection in the master bedroom. I can establish a connection, but it is intermittent with frequent drops. I have verified this with both laptops by working in the master bedroom for an entire day on both laptops. The Internet connection in this master bedroom proved to drop out frequently - about once an hour with the laptops. The wireless connection and the frequency of its dropout are far worse with the iPod touch and an iPhone.
I cannot relocate the TC. Also, this is an apartment and I therefore cannot extend the range of my network with Ethernet cable (I cannot drill through walls/ceilings, etc.). It is an old building with antiquated wiring and power-line adapters are not likely to function properly, nor can I spare the direct power outlet required with a power-line adapter. I simply need every outlet I can get and cannot afford to block any direct outlet.
My solution is to use a more powerful wireless router. I found the ASUS RT-AC66U Dual-Band Wireless-AC1750 Gigabit Router which will likely provide a better connection to my wireless Internet in the master bedroom than the TC. The 802.11ac band of this Asus wireless router is totally useless to me, but based on what I have read I believe this router will provide a stronger connection at greater distances then my TC. And I will be ready for 802.11ac when it becomes more widely available.
However, I still need to maintain the TC's ability to work seamlessly with TM to backup my two laptops. Also, I doubt the new Asus router will provide OS X 10.8.2 with NAS like features and capabilities. Therefore, I still would like to use the TC's NAS capabilities to share files on my network wirelessly assuming the Asus wireless router fails to provide this feature. I need a new and more powerful wireless router, but I need to maintain the TC's NAS features and seamless integration with TM. Finally, I want to continue to use my Apple laptop and AirPlay to wirelessly access and play my iTunes music collection stored on the TC's hard drive. I also want to continue to use my Apple laptop, AirPlay and Apple TV to wirelessly watch movies and TV shows stored on the additional external hard drive connected to the TC via USB. Can someone advise on how to set-up my existing TC with this new Asus wireless router in such a way to accomplish all of this?
Modem
Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
Existing Wireless Router and Primary Wi-Fi Base Station - Apple Time Capsule
Apple Time Capsule MC343LL/A 1TB Sim DualBand (purchased June 2010, likely the Winter 2009 Model)
Desired New Wireless Router and Primary Wi-Fi Base Station - Non-Apple Asus
ASUS RT-AC66U Dual-Band Wireless-AC1750 Gigabit Router
Extended Wi-Fi Base Station - Provides an Ethernet Connection to a Denon A/V Receiver Two Rooms Away from the Modem
Netgear Universal Dual Band Wireless Internet Adapter for TV & Blu-Ray (WNCE3001)
Addition External Hard Drive Attached to the Existing Apple Time Capsule via USB
WD My Book Studio 4TB Mac External Hard Drive Storage USB 3.0
Existing Laptops on the Wireless Network Requiring Time Machine Backups
MacBook Air (11-inch, Mid 2012) OS X 10.8.2
MacBook Pro (13-inch Mid 2010) OS X 10.8.2
Other Existing Apple Products (Clients) on the Wireless Network
iPod Touch (second generation) is model A1288.
iPad (1st generation)
Apple TV (3rd generation) - Quantity two (2)

Thanks Bob Timmons.
In regards to a Plan B, I hear ya brother. I am already on what feels like Plan Z. Getting WiFi to a far off room in an apartment building crowded with WiFi routers is a major pain.
I am basing my thoughts on the potential of a new and more powerful router reaching the far off master bedroom based on positive reviews on cnet.com, pcmag.com and pcworld.com. All 3 of these web sites have reviewed the Asus RT-AC66U 802.11AC wireless router as well as its virtual twin cousin 802.11n router. What impressed me is that all 3 sites rated this router #1 overall in terms of both range and speed (in both the 802.11n and 802.11AC flavors). They tested the router in real world scenarios where the router needed to compete with a lot of other wireless routers. One of the sites even buried this Asus router in a media room with thick walls and inside a media cabinet. This Asus router should be able to serve my 2.4 GHz band wireless clients (iPod Touch and iPhone 4) with a 2.4GHz Wireless-N band offering some 50 feet of dependable range and a 60 Mbps throughput at that range. I am hoping that works, but it's borderline for my master bedroom. My 5 GHz wireless clients (laptops) will enjoy a 5GHz Wireless-N band offering 150 feet of range and a 200 Mbps throughput at that range. I have no idea what most of that stuff means, but I did also read that Asus could reach 300 feet and I got really excited. My mileage may vary of course and I'm sure I'm making some mistakes in my interpretation of their data. However, my Winter 2009 Time Capsule was rated by cnet.com to deliver real world performance of less than that, and 802.11AC may or may not be useful to me someday. But when this Asus arrives and provides anything other than an excellent and consistent wireless signal without drops in the master bedroom it's going right back!
Your solution sounds great, but I have some questions. I'm using OS X 10.8.2 and Airport Utility (version 6.1 610.31) and on its third tab labeled "Wireless" the top option enables you to set "Network Mode" to either:
Create a wireless network
Extend a wireless network
Off
Given your advice to "Turn off the wireless on the TC," should I set Network Mode to Off? Sorry, I'm clueless in regards to how to turn off the wireless on the TC any other way. Can you provide specific steps on how to turn off the wireless on the TC? If what I wrote is correct then what should the rest of this Wireless tab look like, or perhaps it is irrelevant when wireless is off?
Next, what do you mean by "Configure the TC in Bridge Mode?" Under Airports Utility's fourth tab labeled "Network" the top option "Router Mode" allows for either:
DHCP and Nat
DHCP Only
Off (Bridge Mode)
Is your advice to Configure the TC in Bridge Mode as simple as setting Router Mode to Off (Bridge Mode)? If yes, then what should the rest of this "Network" tab look like? Anything else involved in configuring the TC in Bridge Mode or is it really as simple as setting the Router Mode to "Off (Bridge Mode)"?
How about the other tabs in Airport Utility, can they all stay as is assuming I use the same network name and password for the new Asus wireless router? Or do I need to make any other changes to the TC via Airport Utility?
Finally, in regards to your Plan B suggestion. I agree. But do you have a Plan B for me? I would greatly appreciate any alternative you could provide. Specifically, if you needed a TC's Internet connection to reach a far off corner of your home how would you do it? In the master bedroom I need both a wired Ethernet connection for the Denon a/v receiver and wireless Internet connection for the iPhone and iPod Touch.
Power-Line Adapters - High Cost, Blocks at Least One Wall Outlet and Does Not Solve the Wireless Need
I actually like exactly one power-line adapter, which is the D-Link DHP-540 PowerLine AV 500 4-Port Gigabit Switch. This D-Link power-line adapter plugs into your wall outlet with a normal sized plug (regular standard power cord much like any other electronic device) instead of all of the other recommended power-line adapters that not only use at least one wall outlet but also often block the second outlet. You cannot use a power strip with a power-line adapter which is very impractical for me. And everything about my home is strange and upside down. The wiring here is a disaster and I don't have faith in its ability to carry Internet access from the living room to the master bedroom. And this D-Link power-line adapter costs $90 each and I need at least two to make the connection to the Denon A/V receiver. So, $180 on this solution and I still don't have a dependable drop free wireless connection in the master bedroom. The Denon might get its Ethernet Internet connection from the power-line adapter, but if I want to use an iPhone 4 or iPod Touch to stream AirPlay music to the Denon wirelessly (Pandora/iTunes, etc.) from the master bedroom the wireless connection will not be stable in there and I've already spent $190 on just the two power-line adapters needed.
Extenders / Repeaters / Wirelessly Extending the Wireless Network
I have also read great things about the Amped Wireless High Power Wireless-N 600mW Gigabit Dual Band Range Extender (Repeater) SR20000G and the My Net Wi-Fi Range Extender. The former is very powerful and the latter is easier to install. Both cost about $150 ish so similar to a new Asus router. However, everything I read about Range Extenders points to them not being very effective for a far off corner of your house wherein it's apparently hard to place the range extender in the sweet spot where it both gets a strong enough signal to actually effectively extend the wireless signal and otherwise does not reduce network throughput speeds to unacceptable speeds.
Creating a Roaming Network By Hard Wiring with Ethernet Cable - Wife Would Say, "**** No!"
Even Apple seems to warn against wirelessly extending your network (see: http://support.apple.com/kb/HT4145#) and otherwise strongly recommends a roaming network where Ethernet cable is used to connect two wireless base stations. However, I am in an apartment where stringing together two wireless base stations with Ethernet cable would have an extremely low wife acceptance factor (WAF). I cannot (both contractually and from a skill prospective) hide Ethernet wire in the walls or ceiling. And having visible Ethernet cable running from room-to-room would be unacceptable, especially to the wife.
So what is left? Do you have a Plan B for me? Thanks in advance for your help!

Time Machine backup and VmWare Fusion

Hello,
I added a 500GB external hard drive to my new iMac so that I can take advantage of Time Machine backups.
My question is that does Time Machine also make backups of my XP system that is running in VmWare?
I'm not really keeping any "files" on my XP machine as I am keeping them on my Mac's drive.
Thanks
David

Open the TM application, locate the files you want to delete, then use the tool gadget drop down menu in the Finder window's toolbar where you can select options for deleting selected items.
Consider excluding some items from you backups to reserve space. Exclude system files such as the System folder, exclude your VM Fusion files, exclude any additional hard drives connected to your computer. Excluding such things can save gigabytes on every incremental backup.
Use a third-party utility such as TimeMachineEditor to change the frequency of backups from hourly to daily, for example.
Message was edited by: Kappy

Can Time Machine Backup to Two Different Drives?

I have many Apple Computers, and I was wondering if it were possible to have time machine backup to two different drives.
I want it to back up My documents, Mail, and other files/folders that I access often to a partition of my internal drive every minute.
And
I want it to back up Everything on my Mac to my external each night upon connecting it to my mac.
I take my MacBook everywhere with me and I need to make sure that the files I work on the most stay Perfectly Accessible no matter what, and I don't want to sacrifice too much space for that procedure. I would rather just be able to do constant backups of my most used files and folders, and then do a system backup each night to make sure I always have what is needed.

Let me add some more observations. I use two disks, one at home (its a mounted volume on another Mac at home) and the other is a portable disk that I attach to my MBP at work. This works fine.
About your details - TM backs up every hour. If you look around you'll find some posts that give instructions on changing the frequency (I haven't paid attention to these, so I can't help you). However, backing up to another partition on the same drive is not what I'd recommend. If the drive dies, you may lose both partitions.
As for doing constant backups of the most used files and at night doing a system backup - it seems to me you aren't "getting" TM. This sounds like the type of backup strategy one uses with "regular" backup software. I don't think I'd recommend backups every minute, but for short intervals, why not just do a default backup of everything. It doesn't really back up everything, just things that have changed. The only time it does a complete backup is the first time you use it with a specific drive. After that it no longer does complete backups, unless you reformat the drive and start from scratch.

Data Recovery of Time Machine Backup From a Corrupted Drive

I had to install 10.2 and 9.2.2 on an internal drive in my 2003 MDD G4 but first I had to reformat it (and wipe out its data) since it did not have OS 9 drivers installed. No problem thinks I since its contents are backed up to my 500 GB Western Digital HD. Installation of 10.2/9.2.2 was successful but when I go back into 10.5.8 to restore the contents of the newly formatted drive the external drive with the Time Machine backup will not mount. It churns and grinds forever and nothing I've tried (after consulting the WD support web site) helps. It is recognized by Disk Utility but that is all.
Any thoughts on whether/how to recover the lost backup? Many thanks in advance.

mvaldeslora wrote:
Well, I am happy to report a happy ending. Turns out DW had crashed but I initiated the procedure again and it was able to rebuild the drive's directory in a couple of hours. Time Machine then recognized the drive and I was able to restore the contents of the drive on which I installed 10.2/9.2.2 earlier in this saga. I will reformat the external WD drive now and see how it performs before I decide whether it's a keeper or not. Thanks for all comments and observations.
Yay!
If those are your only backups, please do yourself a favor: do not trust them to that drive! Get a new one, and put TM backups on one, and use the other to regularly update a "clone" or at least home folder backups via CarbonCopyCloner, SuperDuper, or the like.
Murphy was an optimist!

I have replaced my old hard drive with a new SSD drive. Can I restore a complete Time Machine backup

I have replaced my old hard drive on a MacBook Pro midyear 2010 with a new SSD drive. I have a complete system backup of my old drive in an external hard drive using Time Machine.
Questions that I would like to get answered.
1) Can I connect my external hard drive to the macbook pro and use that to boot up my machine by pressing and holding down the Options key? Once booted up successfully, can I use Disk Utility to format the new SSD and then restore the complete time machine backup?
2) If that is not possible, can I use my old drive which I can connect using a USB adapter and use that to boot up by following the same strategy as listed in Step#1 above?
3) If neither options are possible, do I need to use a bootable USB drive for Mavericks OS X to boot up the machine,
I have Mavericks OS X ( 10.9.6) and I do not have a DVD of the OS.
Any help is appreciated.

Let me first document the steps that did not work and then I will document the steps that worked.
1) Replaced the hard drive with SSD.
2) Connected the original hard drive using a USB adapter to the MacBook to make it behave like an external device.
3) Powered on the machine and on hearing the chime pressed Command-R to start in recovery mode.
4) Chose the Disk Utility option to erase and format the SSD. The format chosen was Mac OS Extended Journaled.
5) Once the formatting was done, then clicked on the "Restore" tab in Disk Utility
6) In the Source field, dragged my original hard drive from the left pane and placed it in the field
7) On the destination field, choose the new SSD drive. Clicked on "Restore". Gave me a warning, accepted the warning and the restore was under way.
8) I had 236 GB to restore so took 3.5 hours before it was done.
9) Disconnected the external hard drive ( my original internal HDD), shut down the machine and powered on again.
10) Heard the chime and after that it was a white screen with no Apple logo.
Was visibly upset and started thinking what my next move will be. Then tried these steps
1) Again powered off the machine.
2) Connected my internal HDD once more as an external drive
3) Powered on and on hearing the chime, pressed Command-R as before
4) Once the OS X utilities screen popped up, this time chose Install OS X
5) Erased the contents of SSD once more and reformatted it using Mac OS Extended Journaled.
6) Installed OS X by following the prompts.
7) Once the OS was installed, I was presented with an option on how to transfer data to this new Mac
8) Chose the option to move the data from my original HDD.
9) Took another 3 hours to move the data.
10) Removed the original HDD once the transfer was complete, powered down the machine and started it once more.
11) Booted successfully and all my content is now accessible on the new SSD.
Moral of the story - It is the spirit that counts.

I'm having a hard time setting up my external hard from with my AirPort Extreme and Time Machine Backups.

I have been using a Mac Mini with an external hard and Time Machine. I bought an Airport Extreme and have had problem setting up the hard drive using the USB port on the Airport Extreme. I also just recently bought a Mac Book Air and hope to have both computers back up to the external hard drive using Time Machine and Airport Extreme. I have been using the optical drive from the Mac mini to load programs into the Mac Book Air. I think I'm just getting confused in Finder. I am just not seeing the hard drive. I ended up plugging the hard drive back into the Mac Mini and that is work fine again. How do I setting the external hard drive up to the AirPort Extreme and use for both computers? Or at least to start with the Mac mini.

It's critical to understand that Time Machine (TM) stores backups differently between local and network drives. That would mean the TM backup on your locally attached USB hard drive will not be directly useable when it is connected to the AirPort Extreme Base Station (AEBS). There is a way to copy a local version to a network version, but it is not fool-proof. When you do connect this drive and point TM to it, TM will start a brand new backup, leaving your existing backup as is.
If your current backup is critical to you, you may want to consider getting a second USB drive to attach to the Extreme and use your existing one as a backup ... or use TM's multi-backup process to backup to more than one destination drive alternatively.
So, at this point, you may want to make a decision on how you want to go forward to help provide a solution for you.
To directly answer your question, when you go to select a destination for a Time Machine backup, the drive(s) that show up under "Backup Disks" are those that TM already recognizes and has backed up to. Those listed under "Available Disks" are drives (either local or on the network) that TM can back up to.

Initial Time Machine Backup Stuck on "Indexing Backup"

I have Mac Mini running 10.7.2. I just got an external hard drive and am trying to run an initial back up using Time Machine. I am running my computer in Safe Mode as it won't start in regular mode. I formatted the HD and began to run Time Machine back up. HD is connected via USB 2.0 wire.
It has now been 12 hours and is still on Indexing Backup... Is this normal for initial back up? I know it takes a long time for initial but this doesn't seem right.What do I do to correct if it isn't correct? Should I stop and try again?

Thank you very much. With your info I gave up on the back up and ran Disk and Permission Repair for the 3rd or 4th time and crossed my fingers and restarted my machine and it WORKED! I ran time Machine back up and when I woke up this morning it was all done! Yeahhhh!
I wasn't sure what was causing it not to start in regular mode and as I'm not too much of a techie I was scared that I was teetetering on the brink of losing everything. The machine would run so I didn't think it was a hard drive issue, but not knowing for sure I was concerned and after losing everythign once before years ago, I was worried. I have it backed up on line but wanted a 2nd (local) version that wouldn't entail tying up bandwidth for days. In the end it worked out!
But the short answer is, Time Machine Backup does NOT work in Safe Mode...

Restore Time Machine backup after hard drive crash

My hard drive on the mac book crashed, so I replaced it. Now I need to get my time machine back up on the new drive. I've already started using the computer and reinstalled lion, so I'm not getting the original "backup" screen. How do I find my old time machine backups?

Your best bet is to do a full restore from your backups. See #14 in Time Machine - Frequently Asked Questions.

Can SL restore from a Lion Time Machine backup?

I want to downgrade from Lion to SL. If I do a fresh install of SL will it be able to read my Lion Time Machine backup to restore my applications and data?

To clarify any perceived inconsistency between my advice and that of sig's, my presumption was that you were going to do a complete restore from Time Machine. If that's not the case, sig's advice is important.

Frequency of time machine backups

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