I have ABackup, but normally use the "Backup Files & Dirs" option, and also have a fairly small hard drive. If you have very large partitions or wish to backup multiple partitions at once, keep in mind that most Amiga backup software (ABackup included) will likely not support 64-bit arithmetic for Partition backups. A practical example: in ABackup, if the total size of the partitions exceeds, err, 2^31, ABackup reports negative numbers. :-( Likely not a reliable way to go.
Todd