View Full Version : 320gb with 25gb used > Backup makes 320gb image?

09-03-2008, 12:51 PM

This is probably a very noob question, I did some reading on this forum, but did not find an answer to reflect my problem.

Basically, I have a 320gb drive single partition. I am only using 25gb on it, when I did a superduper backup (backup all files to a disk image), I thought it would make a 25gb file. Instead it make a 320gb file (well actually 274gb, whatever was the remainder the free space on my HD). Is there a way to configure superduper just to make a disk image of the space used on HD (25gb)?

Many thanks!

09-03-2008, 01:00 PM
Over time, the image will grow to the size of the source drive, purely because of the way HFS+/OS X manages image files.

If you want to 'shrink' it, open Terminal, type

hdiutil comptact

with a space after it, and drag in the (unmounted) sparse image file. Press Return at the end and it will shrink.