The partition limits, that where a problem in the past (due mostly to DOS and windows set ontop of that), do not apply any longer...
if the drive is to be used purely for backup images, etc. then by all means keep it as one partion/drive...
but if you plan on doing file storage, e.g. multimedia files, then I would logically separate the drive into two or more partitions, e.g. partition 1 called BackUpC (for your back up of drive C) size around 50% of the drive or at least twice the size of C for two backups and similar for the other two partitions but in varying sizes depending on the need...
but that is just what I would do...
Ben
"If it works don't fix it! If it doesn't use a sledgehammer..."