Are firefly and actual different enough to justify running both? I'm looking into them myself.

As for suggestions on other things to host, maybe a recipe manager like Mealie, Tandoor or nextcloud cookbook?

What do you have inputting into influxdb? I've been looking into setting up some monitoring for my proxmox/VMs/dockers

I don't know if it's a smart solution but I have a HDD in my server that is used just for backups, each night I have rsync automatically moving stuff from multiple locations that I want to back up onto the drive. After that is done I have Kopia backup to B2, with compression, deduplication and encryption. I use healthchecks.io as well to alert me if any of the steps fails to complete (but none of the steps block each other).