I have recently repurposed and old Hp Stream to a home server and successfully run Immich. I really like it and even a small 500GB disk is way more than the 15GB Google offers.
My issue though is about backup. I would only be comfortable if all the data is backed up in an off-site server (cloud). But the back up storage will probably cost as much as paying for a service like ente or similar, directly replacing Google photo.
What am I missing? Where do you store your backup?
I have my Immich library backed up to Backblaze B2 via Duplicacy. That job runs nightly. I also have a secondary sync to Nextcloud running on another server. That said, I need another off prem backup and will likely run a monthly job to my parents house either via manually copying to an external disk then taking it over or setting up a Pi or other low power server and a VPN to do it remotely.
So you just mount the immich folder in the duplicate container? Or run it native?
Immich and Duplicacy both run on my unraid server. Duplicacy just watches the Immich pics folder and backs that up nightly.