Sorry for the misinformation.  You're correct.  Look on page 50 of the Ghost manual.  In all my uses of Ghost 10, I always selected the option "Independent Recovery Point" so that I am in control of the images, not Ghost.

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Recovery point set
Creates a base recovery point with additional recovery points that contain only incremental changes made to your computer since the creation of the base recovery point.

Incremental recovery points are created faster than the first (base) recovery point and use less storage space than an independent recovery point. If the Recovery Point Set option is disabled, it is because you have already assigned a selected drive to an existing recovery point set and you can only have one recovery point set defined for each drive. Or, you might have selected an unmounted drive that cannot be part of a recovery point set.

Independent recovery point
Creates a complete, independent copy of the drives you selected.  This backup type requires more storage space.
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For Ghost to manage a recovery back to a point in time, I'm guessing that the software can only keep track of the catalog with one drive.

All this is new in Ghost 10.  Ghost 9 was in essence DriveImage 8.

Have you ever looked at Symantec's LiveState Recovery Desktop?

http://www.symantec.com/small_business/products/backup_recovery/lsrdt30/features...

I've never used it, and I'm not sure how the desktop version compares with Ghost.  Please inform us all if you know--and also if it verifies the contents of the backups and also if it allows multiple recovery points per volume in the catalogue.

The server version of course is quite a bit more expensive.