Differential backups - why so big a file?

Discussion in 'Acronis True Image Product Line' started by martinlest, Apr 26, 2006.

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  1. martinlest

    martinlest Registered Member

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    Just wondering why my differential backup files are so big! I made a full backup of my C Drive a couple of days ago (come to 7 GBs) and have just made a differential backup - which is 1.5GBs.

    Is that normal? I haven't added anywhere near that amount of data to my drive - just made a few tweaks to the setup. Is it possible to see what the differential backup alone contains and get an idea why it is so large? (If I explore the image, I think I get to see what is contained in the full backup tib file as well as the differential one, no?).

    Martin
     
  2. TheWeaz

    TheWeaz Registered Member

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    I’ll have to assume you’re running Windows.
    Since TI backups up “in use” sectors, files do not have to change to be included in a DIFF, only moved. Windows does this in the background (BootOptimizeFunction) as well as creating/deleting System Restore Points. Any/all of this can result in a large than expected DIFF/INC file.
     
  3. martinlest

    martinlest Registered Member

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    Yes XP. OK, so be it. Thank you for the reply.

    Martin
     
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