Problem backing up

I recently updated to v1.10.4 (on win10, if that matters) and since then I’ve been getting a bunch of Javascript related errors and frequent requests to resync DAO (E: which I do each time, but keeps happening) so I figured I try to do a fresh install, but when I go to create a backup before uninstalling, I get this:

“Warning

The directory you have chosen is not accessible.

Error message: The process cannot access the file because another process has locked a portion of the file”

I have tried using several different locations on 3 different drives, but the same keeps happening.

It is backing up some information, but I’m concerned it isn’t complete/has errors.

Is there a safe way I can verify the back up and/or fix the problem and create a clean one?

TIA!