I'm using ARCserveIT, but the same requirements should apply. You will need the Enterprise edition of ARCserve (if you are installing on NT and wanting to back up Novell) - Enterprise is a must for backing up more than one machine. Also, you will need the Push Agent for NetWare. Also also, it wouldn't hurt to have the Open Files Agent.
And with ARCserve, each agent is purchased seperately. Right now, you're up to three.
Anyone know of anything else?