hey @cauchy33 welcome to the community
first off some requirements have not been met, but its been running for two years…
can you be more precise please
did you follow this procedure How to backup, restore and migrate Nextcloud snap ?
post the output of snap list and then sudo snap services nextcloud best would be to run the debugging script and post the output here
if its just a matter of OCC not working, then;
Some systems don’t add
/snap/binto the $PATH. Try
sudo /snap/bin/nextcloud.occ
do check out Nextcloud snap wiki and support