Retrospect is intelligent. It will only backup computers who haven't been backed up recently, and will queue computers so that those who have been backed up least are given first priority on subsequent backup sessions. There are some other features of the Retrospect package that bear mentioning. However they are not part of the core program's features. But they do make your life a little easier.
Retrospect comes on a bootable CD, in case of system crashes.
This same cd also includes disk image files so you can make floppy disks for those computers which do not have CD ROM drives. Manuals are an important part of any software package. It is increasingly hard to find printed manuals included with a program. Even more rare is a comprehensive manual. Retrospect comes with a very impressive manual.