Yes you just taught me I’m paying more than I needed to using their B2 directly lol but I gave a few different backup buckets configured and I don’t mind paying a little extra for flexibility, vs paying for each machine I want data backed up on.

I use Duplicati and I THINK it has a container option? It is a web UI though.

I have my Immich library on a network drive and I took the lazy way and have my desktop duplicati just back up the network drive instead of directly on the server 😅

Backblaze B3, backup software of your choice pointed at the Immich library. Photos get put into Immich, backup runs, data encrypted and saved offsite.