TerraMaster Official Forum

They do have a version for TOS 4 in the community section, not sure if it will work for the f2-210 or not. It's listed under apps not by TOS version. Other than that, I'm not sure what else to try.

I had the same problem with partial copies. I switched to Midnight Commander and haven't had a problem, though if you're looking for scheduled daily/weekly backups I'm not sure if it does that.