I had this happen to me as well, though I remember that it was either a docker or snap/flatpak/etc version of it. Got things working but lost a few months of data, likely something I foolishly did while trying to make things work. Stopped using it and went with Seafile for a while - grew frustrated with that and stopped syncing files between computers altogether.
Later on, when I set up an old dell xeon workstation as a home server (using proxmox), I used the turnkey image of nextcloud, and have (knock on wood) not had any issues at all.
Anyway - I wanted to ensure it was fully virtualized this next time if/when this happens again. I have it backing up the base vm once a week (I have the file storage separate/outside of the vm). So... hopefully this doesn't happen again to the degree that it did.
Later on, when I set up an old dell xeon workstation as a home server (using proxmox), I used the turnkey image of nextcloud, and have (knock on wood) not had any issues at all.
Anyway - I wanted to ensure it was fully virtualized this next time if/when this happens again. I have it backing up the base vm once a week (I have the file storage separate/outside of the vm). So... hopefully this doesn't happen again to the degree that it did.