If i back up my mac using Time Machine and an external hard-drive, can that same hard-drive be used on another computer and on a PC?

Hi!
I hav just got a macbook pro and am used to using a HP pc and am a newbie! I have backed up my macbook with my elements external hardrive and was wondering if i can transfer the music i have purchased and is now on my external hard-drive back onto my other laptop purely because i use both laptops for different things and want to use my music on both. how do i do this? and do i need a particular software to do so?
Any tips would be greatly appreciated
thanks
alex xxx

Welcome to Apple Support Communities
You can do it, but it's not recommended to use a Time Machine volume to store other files. In this case, you can create a second volume on the external drive, so you will be able to use it to store data and transfer it to other PCs.
As you are going to use the external drive with other PCs, you can make the volume and format it in "MS-DOS (FAT)" with Disk Utility > http://pondini.org/OSX/DU3.html Finally, you will be able to copy files to the external drive.
If you copy files to a Time Machine disk, you may damage the Time Machine file structure, so you shouldn't do it. It may not happen, but it's better not to try that. Also, you won't be able to read the Time Machine drive in a PC

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HT201250 I've just used an external drive to back up my Mac with Time Machine. I have Lion, but didn't click and check the "Encrypt Backup Disc". What should I do? Can I delete the external drive and start again, or can I encrypt later?

I've just used an external drive to back up my Mac with Time Machine. I have Lion, but didn't click and check the "Encrypt Backup Disc". What should I do? Can I delete the external drive and start again, or can I encrypt later?

I guess if stolen or lost it would protect my "stuff", and if I'm travelling would protect my privacy.
You must understand the purpose and implications of encryption before deciding whether to use it.
Encryption locks your data with a password. If you forget that password, the data is lost beyond any chance of recovery. Neither Apple nor anyone else will be able to help you recover that data if you don't know the password.
By the same token, the password must be strong enough to provide the security you want. For example, if you're the potential target of industrial espionage by a government or large corporation, you need the strongest possible password. To create and manage such a password safely is a task in itself, not to be undertaken lightly.
If you're only concerned about casual snooping by someone with no special skill, a weak, easily-remembered password is appropriate.
But regardless of the strength of the password, if you lose it, the data is gone forever.
Another point to remember is that if you encrypt your data on one storage device, you must also encrypt it on all other storage devices that would be accessible to the same attacker. Otherwise the data isn't protected. For example, if you keep your computer and your backup drive in the same room, and the internal drive of the computer is not encrypted, then there's no point in encrypting the backup drive.

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I use Time Machine with an external hard disc which has worked perfectly for some years. Recently Time Machine has aborted backups if the screen saver starts when back-up is in progress. I use a Maxtor OneTouch4 back-up system. Any ideas?
Has Apple recently up-dated my OS (Lion) such that every time the screen saver starts it disables Time Machine. I have to switch-off the computer and re-start in order to undertake a back-up. I have now switched of all screen savers.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode.)

I am trying to get an answer to whether or not I can successfully use Time Machine with an external HDD connected to an airport extreme? Some forums say yes, some say no.

I am trying to get an answer to whether or not I can successfuly use Time Machine with an external HDD connected to an airport extreme. Some forums say yes, some say no. I'm also curious about formatting the hard drive to work both on my wife's MacBook Pro and my PC. Any help would definitely be appreciated.

You may be going on a recollection, that I share, that at one time Apple stated this would be possible:
In fact, Apple’s Time Machine Web page touted this very capability as recently as last Tuesday, as you can see from Google’s October 16 cache of the page
Effortless meets wireless. With a hard disk connected to your AirPort Extreme Base Station, all the Macs in your house can use Time Machine to back up wirelessly. Simply select your AirPort Disk as the backup disk for each computer and the whole family can enjoy the benefits of Time Machine.
But if you look at the current Time Machine page on Apple’s Web site, that text is nowhere to be found.
That was a long time ago, it has never been officially implemented, and at present they specifically say it cannot be done.
In summary, it may work, but probably won't, and even if it does it may not be reliable.
Reference:
Disks that can be used with Time Machine
Time Machine can’t back up to an external disk connected to an AirPort Extreme, or...
and
Mac OS X v10.5: Time Machine doesn't back up to AirPort Extreme AirPort Disks

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Hi…I’m new to this, I hope someone can help me=)
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Then when I click “Select backup Disk”, it goes on like this:
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So what is your question?
If you forgot your encryption password:
Warning: Make sure it's a password you will remember or write it down for safekeeping. If you encrypt an iPhone backup in iTunes and forget your password, you can't restore from backup and your data will be unrecoverable.
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The above comes from here:
http://support.apple.com/kb/HT4946

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Thank you in advance.

Eric Root wrote:
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zachnasty19 wrote:
do you know how to remove the snapshot backups? I can't find where they're stored.
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Hi all,
I've searched for information on this and getting nowhere. Not sure if it's possible, but I have two USB hard drives now as I've run out of space on my laptop. So therefore I really use one of the hard drives for my main storage and drag files across to the other one to back that up.
It would be easier if I could just use time machine to back up the one external hard drive to the other. I don't want to just replicate what's on my laptop hard drive.
Does anyone know if this is possible? Would appreciate any help.
Cheers
Paul

Thanks for your reply V.K. much appreciated.
I have gone into the options and I can see my external drives there, but for some reason I can't remove them from the exclusion list. I can add and remove the Laptop HD from this list, but for some reason the "-" button becomes disabled whenever I select the external Hard Drives.
Is there a reason for this? I've been using both drives for a while, so they are both Mac formatted.
Thanks again.

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I have been using a Mac Mini running 10.6.8 for years as a media server. I have always been very careful to maintain backups of everything, and the inevitable did happen - the hard drive containing all my media did fail.
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This web site might answer all of your Time machine questions:
http://pondini.org/OSX/Home.html
Ciao.

If i back up my mac using Time Machine and an external hard-drive, can that same hard-drive be used on another computer and on a PC?

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