I created a Acronis Secure Zone on a drive using Acronis TrueImage 9. It was 20Gb in size, and now it contains the following three Operating system at the cleanest stage (at least at this momemnt):
- Windows XP Sp2 with all windows update completed, and checked with no spyware.
- Macintosh OSX Tiger 10.4 for Intel machine.
- CentOS 4.2 tailor for my desktop machine.

What surprised me was that the Trueimage 9 can compress (using Maximum setting) all three partitions within the 20Gb of space.

And now that I have a backup, I am freely messing with the three OS without any worry.