For archive, it’s very hard to beat StorageDNA for both features and price. Greatest advantage over other solutions is the ability to use your LTO archive as pseudo nearline storage as well. You can easily park projects/assets on LTO to free up SAN space and bring them back when needed with a high degree of intelligence.
I’d definitely recommend moving from HDDs to an LTO device of some kind. Longer (and dependable) shelf life, easy ability to make copies, physically smaller, and cheaper per TB. Whatever you look at, make sure the system (and software) supports LTFS. Last thing you want is a tape that has a proprietary compression or file system on it; a friend of mine has to keep an old version of his archiving software around just to read his tapes. In disaster recovery, ease of access is a big deal.
Marshall Graphics Systems
Carolinas Representative