Proxmox wont make backups to B2 easier, but since it is basically a web interface and API for Debian and KVM/QEMU you might be able to use your current backup strategy with very little modification.
I found this which leads me to believe I may be able to pipe zfs send to restic to replicate my current disk backup strategy. Presumably I could fire up a VM and build a zfs storage pool in it to test that theory out.
As for ZFS, you can expect to use about a GB of RAM for each TB in a ZFS pool. I (only) run 2x 4TB drives in ZFS mirror and it results in about 4-5 GB of RAM overhead.
So if I were to put 4x4TB in a RAID10 equivalent pool I’d be looking at ~ 8GB not 16, whew.
For a homelab it’s a bit much, the learning experience is the biggest part. It’s an entire rabbit hole.
The rabbit hole is where all the fun is. Templating was something I never really got around to in my current setup. I do have an ansible playbook and set of roles that will take a brand new Ubuntu VM and configure it just how I like it.
Thanks for all the info. I’ll be sure to check out your repo.