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Size of disk backup file

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It normally is about the size of the diskspace in use of the source. Compression will reduce the size for files that are compressable (many are not) and some overhead is added for checksums that are embedded inthe file every few thousand bytes or so.

I have recently purchased ATI Home 2012 (build 6154) and run my Win7 system on a nominal 120 Gb SSD (111Gb useful) with about 51Gb used - ie 60 Gb unused. Can you tell me why my backup (.tib) file - on a separate 1Tb HDD - is coming out at 121Gb. I have tried max compression but it makes no significant difference. I would value any help in reducing the size as I take regular full backups.

Are you sure you have not turn on the sector by sector option in the backup options?. If your SSD contains your OS only, your backup size should be about 20GB.

Thanks for coming back to me, Pat. I have definitely not had it on "sector by sector". Also I have tried "full backup" and "interim backup" both with the sames result - ie about 121Gb.
Have you any further suggestions - is this anything to do with it being an SSD (rather than HDD). I have a dual boot system and on XP (on separate HDD) it is giving a "proper" result - ie files about 6Gb.

Mike,

When you double click on the created TIB file, how many partitions do you see there? I just want to make sure that you are no backing up some data that you don't expect.

Other than that, run chkdsk /r on the disk you are backing up, or use the check for errors options on the disk properties, and check both option boxes.

Hi Pat

Thanks again for coming back.
When I double click on the created TIB file it shows two "drives" - the "C" drive (SSD) which I was aiming to backup and the "F" drive (destination drive). Have you any idea how this could be happening? I haven't run chkdsk yet.

Hi Pat
Have run problem to earth. For some reason ATI was defaulting to selecting these two drives. Once I selected "Multiple Partitions" then "Disk Mode" then un-ticked the "F" Drive - leaving only the "C" Drive selected - everything worked OK. Backup size was 25Gb.
Thanks again for your help

That makes sense.