You can configure Syncthing to keep deleted/changed files for some time. So you could connect a Raspberry Pi to store everything read-only.
I used to manually remove for example the GPS location when using Reddit since I don't trust them. Does Lemmy or any Android client remove it by default?
You can configure Syncthing to keep deleted/changed files for some time. So you could connect a Raspberry Pi to store everything read-only.