Time machine backups cache and temp files?

Just bought a new external usb disk and used it as the time machine backup volume. All time machine configurations are remained as default, so it would backup all my current HD. While watching it estimating the time that the first backup would take, a question jump out in my mind:
Will time machine backup all files "honestly"? Will it make a copy of every file including the Internet cache and temp files when I'm browsing websites? I'm used to watch youtube a lot, and the temp flv file would be large (though I don't know where it is stored on Leopard). If these files would be backup-ed as well, I think it would be a great waste of disk space.
Can anyone confirm that those caches and temp files would be copied or not? If it would, how to prevent this? Thank you.

If you wish to exclude anything from the backup simply drag the item into the Exclude list. For example, you can save considerable space by excluding the /System/ folder. Cache files would be found in the /Library/ and /Home/Library/ folders. Each folder contains a folder named Caches. There is no specific folder in which temporary items as stored that is visible to the user because the operating system will usually delete temporary files on its own. This may not be the case for a specific program, however. Browsers may maintain their own reserved cache and temporary files, and manage them on their own.
I do not think, however, that TM backs up caches or temporary files. I find no such items in my TM backup - only the folders. I do not back up my /System/ folder.

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    If you wish to exclude anything from the backup simply drag the item into the Exclude list. For example, you can save considerable space by excluding the /System/ folder. Cache files would be found in the /Library/ and /Home/Library/ folders. Each folder contains a folder named Caches. There is no specific folder in which temporary items as stored that is visible to the user because the operating system will usually delete temporary files on its own. This may not be the case for a specific program, however. Browsers may maintain their own reserved cache and temporary files, and manage them on their own.
    I do not think, however, that TM backs up caches or temporary files. I find no such items in my TM backup - only the folders. I do not back up my /System/ folder.

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    If you wish to exclude anything from the backup simply drag the item into the Exclude list. For example, you can save considerable space by excluding the /System/ folder. Cache files would be found in the /Library/ and /Home/Library/ folders. Each folder contains a folder named Caches. There is no specific folder in which temporary items as stored that is visible to the user because the operating system will usually delete temporary files on its own. This may not be the case for a specific program, however. Browsers may maintain their own reserved cache and temporary files, and manage them on their own.
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  • Slow Time Machine backup with seemingly unnecessary files being processed

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    Feb 19 09:07:34 My-iMac /System/Library/CoreServices/backupd[86218]: Copied 364 files (229 bytes) from volume Macintosh HD.
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    Feb 19 09:11:02 My-iMac /System/Library/CoreServices/backupd[86218]: Backup completed successfully.
    Feb 19 10:03:08 My-iMac /System/Library/CoreServices/backupd[86374]: Starting standard backup
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    Feb 19 10:03:48 My-iMac /System/Library/CoreServices/backupd[86374]: No pre-backup thinning needed: 1.45 GB requested (including padding), 214.67 GB available
    Feb 19 10:07:14 My-iMac /System/Library/CoreServices/backupd[86374]: Copied 58683 files (36 KB) from volume gb.
    Feb 19 10:07:52 My-iMac /System/Library/CoreServices/backupd[86374]: Copied 66813 files (522 KB) from volume Macintosh HD.
    Feb 19 10:07:53 My-iMac /System/Library/CoreServices/backupd[86374]: No pre-backup thinning needed: 1.45 GB requested (including padding), 214.67 GB available
    Feb 19 10:08:00 My-iMac /System/Library/CoreServices/backupd[86374]: Copied 27 files (20 bytes) from volume gb.
    Feb 19 10:08:08 My-iMac /System/Library/CoreServices/backupd[86374]: Copied 369 files (229 bytes) from volume Macintosh HD.
    Feb 19 10:08:11 My-iMac /System/Library/CoreServices/backupd[86374]: Starting post-backup thinning
    Feb 19 10:11:52 My-iMac /System/Library/CoreServices/backupd[86374]: Deleted backup /Volumes/TimeMachine/Backups.backupdb/My iMac/2009-02-18-090731: 214.67 GB now available
    Feb 19 10:11:52 My-iMac /System/Library/CoreServices/backupd[86374]: Post-back up thinning complete: 1 expired backups removed
    Feb 19 10:11:53 My-iMac /System/Library/CoreServices/backupd[86374]: Backup completed successfully.

    Hi, and welcome to the forums.
    First, it's easier to monitor backups via the +Time Machine Buddy+ widget. It shows the messages from your logs for one TM backup run at a time, in a small window.
    It's not unusual for TM to do what seem to be double backups. When it first starts, TM looks at the +File System Event Store,+ a log kept by OSX of all changes to the file system on your disk. It then estimates the size needed, and begins the process. When it finishes it's pre-backup "thinning," if any, and copying of changed items, it then checks again for any changes made during the backup, and does a quick copy of those items.
    TM does occasionally get something wildly wrong about counts and file sizes, as it clearly has for you. Sometimes this seems to be a problem in the File System itself, so I'd suggest you use Disk Utility (in your Applications/Utilities folder) to do a +Verify Disk+ on your internal HD. If it shows any errors, post back if you don't know how to use your Leopard install disk to fix them.
    While you're at it, a +Repair Permissions+ wouldn't be a bad idea (takes quite a while -- at least 20 minutes).
    You might also want to download the TimeTracker app, from www.charlessoft.com.
    It shows most of the files saved by TM for each backup (excluding some hidden/system files, etc.). This may give you some clues as to what's actually being backed-up on each run.
    Give those things a shot and let us know the results.

  • Does a time machine backup also restore system files?

    In my case, I've deleted a lot of system files including desktop wallpapers and stuff, because I split my drive into two partitions, and started running very low on space on my primary partition. Now, I want to go back to two partitions, but I am unable to. Hence I have to format my Mac to do so. What my question is is this. If I use Time Machine after formatting to restore a backup, does that also include system files, like wallpapers and etc., or only user files? What about my keychain, browser data like cookies and other user data from my applications? Does all of that come back too? If it does, then I think that the other system files might come back too, right? I specifically remember deleting files from the Application Support folder. Also, every time after finishing a backup, my disk takes hours for encrypting the backup. Is that normal?
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    Malcolm J. Rayfield wrote:
    Well, I did not maintain backups before I deleted the files. What then?
    Download and reinstall Mavericks from the App Store.  It won't delete any user files.
    Correction
    It should not delete any user files.
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  • Time Machine Backup - All JEPGS & PSD files are lost

    I have backed up all my photos (JPEGS & PSD Files) on my external hard drive before re-installing the operating system.
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    When I inserted my external hard drive in the USB port, a back-up was made on the time machine.
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    OK the scenario you have described does not sound good. Selecting that same external drive to be your Time Machine drive may have resulted in that drive being re-initialised meaning that you have lost whatever data was previously on it.
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  • Incomplete Time Machine Backup - How to Recover Files?

    Hi Everyone,
    Yesterday, while downloading the new OSX Mountain Lion I did a backup to an external hard drive with time machine. For some reason I apparently ejected the HD while the backup wasn't complete. Today while installing Mountain Lion I had two unpleasant surprises, first I couldn't install because it said my disk needed repair so I had to format it, second when I did recover from backup I realized my last backup was incomplete.
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    Thanks in advance!
    Jeronimo

    Hi,
    Thanks a lot!
    I will do so at once.
    Cheers,
    Jeronimo

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