True. I knew I should have left that as “NFS 4” because someone would comment this. From what I’ve read (never used it), NFS 3 is very different to 4 and also just kind of not worth using, especially just for Windows, since it has no security at all.
I use borgbackup, with daily backup to borgbase.
At some point I want to set up a distributed file system between multiple locations as both a backup target and also a network share with automatic snapshots or some other undelete mechanism, but I still need to get the hardware for that and the current setup works well