Hey cool, I hadn’t heard of bacula! Looks like a really robust project. I did look into tape storage, but I can’t find a tape drive for a reasonable price that doesn’t have a high jank factor (internal, 5.25" drives with weird enterprise connectors and such).

I’m digging through their docs and I can’t find anything about optical media, except for a page in the manual for an old version. Am I missing something? It seems heavly geared towards tapes.