I’m running an airsonic-advanced server and use the tempo app on android https://github.com/CappielloAntonio/tempo

And supersonic on linux & windows: https://github.com/dweymouth/supersonic?tab=readme-ov-file

I have a rpi4 awith an external hdd at my parents house, which I connect via a wireguard vpn, mount and decrypt the external hdd and then it triggers a restic backup to a restic-rest server as append only.

The whole thing is done via a python script

I chose the rest-server because it allows “append only”, so the data can’t be deleted easily from my side of the vpn.