I'd like to add a network-attached-storage (NAS) device to several
customer's networks. Looking in the 1 to 2 tb range.

Do you have a recommendation for a unit or product line that works
well with Netware (6.5.8) and eDirectory?

I want to use it for disk-to-disk backup (possibly using Arcserve
11.1), and possibly for storing workstation image files (possibly made
with Acronis or StorageCraft).