If I restore, and then another Differential Backup occurs.. is it huge because the ALL the restored data has moved addresses?

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Hi,

Ok, I have a scheduled Version Chain type backup. It is filling up my hard drive FAST, and I need to save space!!

I am confused as to why my very first Differential backup was so huge?

1. I made the first backup last week, and of course it is the first image so it is Full (104gb).
2. Then, the scheduler made the first backup (112gb) a few days later, and it is a Full as well, which is what I expected from reading how this works.
3. Then, I had computer problems, so I 'restored' to that last backup in 2. And then I installed new graphics drivers, and that is all that I did.
4. Then, today I manually created a new backup, and it is HUGE (103gb)!! In Acronis TIH 2011 it says this last image is a Differential image. So, why is it so huge when all I did was install graphics drivers??

So, my question is... If I restore and image, does it write all of the data to new locations on the disk? And if so, does ATI2011 see ALL of that data as NEW now???? Therefore, it creates a Huge Differential image??

If so, then every time you do a Restore, the next time your scheduled backup runs, it starts with a new Huge image, whether it's a Full or Differential, it will be huge??

Any help is greatly appreciated..

Snacko

Do, 08/18/2011 - 14:19
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Oops, well after more searching, I found the answer to this question. And I was correct.... The quote below is from the Acronis KB (http://kb.acronis.com/content/2712)

There are three possible causes:

  • Defragmentation - An incremental or differential backup created after the disk is defragmented will be considerably larger than usual. This is because the defragmentation program changes file locations on the disk, and backups reflect these changes.
  • Creating an incremental or differential backup after recovering the full one – An incremental or differential backup created after the full one was restored will be considerably larger than usual. This is because restoring a backup archive changes file locations on the disk, and backups reflect these changes.

    (!) In Windows Vista and Windows 7 disk defragmentation is enabled by default. For information how to reschedule or disable it, see Microsoft Windows help page: Start Disk Defragmenter.

  • You have a full backup on the drive/location that you are backing up.
Do, 08/18/2011 - 14:45
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