There's never a need to copy 3 files anyway. If the database is closed cleanly then the WAL file and lock file are deleted. If not (either it's still open or no

There's never a need to copy 3 files anyway. If the database is closed cleanly then the WAL file and lock file are deleted. If not (either it's still open or not closed cleanly) then I think any half-finished transactions will be discarded if you copy all files to a new location. Certainly safest not to copy the 2 extra files in any case.