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I've got WindowsImageBackup catalog which takes up 900GB on my hard drive, of which System Image takes 823 GB. This becomes a problem as it takes nearly half of my data drive.

I'm using "Keep only the latest system image and minimize space" in the system image settings.

System drive size is 255Gb (155 filled and 100 free).

What can I do to decrease the System Image size?

Here's the screenshot of the problem:

enter image description here

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Your question makes no sense. If your system drive is only 250GB then its not possible to have a catalog that takes up 900GB. There are tons of questions about the WindowsImageBackup catalog on this site might want to read some of the better ones. –  Ramhound May 17 '12 at 11:51
It is. the backup is on a drive that is 2TB large. I call it data drive –  Arsen Zahray May 17 '12 at 13:16
I remember a discussion on this very issue on Security Now! and it was discussed that the space taken by the WindowsImageBackup Catalog is often not reported the correct way if you simply do a properties on the folder. I would download a program ( there are many ) that will report each and every file and the size it takes up. I would bet there are some large files taking up the space. I have day 1 Windows 7 installation, all updates, has never had to be reinstalled and my WindowsImageBackup catalog is not that large. There is something else going on. –  Ramhound May 17 '12 at 15:59
@Moab, do you know if the Windows backup can do differentials instead of incrementals? –  user3463 May 17 '12 at 21:56
@RandolphWest don't know for sure, its a very limited image backup software so I doubt it, no real way to configure it either. I used it for a while but found it had too many limitations for me. –  Moab May 18 '12 at 0:22

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