Picard semi-reliably corrupts large music files when moving (I've not yet tested tagging without moving).

Combined with "Move files when saving" this means I lose the original file and so can't restart the operation and try again.

A Copy option should leave the original file untouched and therefore allow for further attempts.

Currently I make a copy of the files before giving them to Picard to tag and move, then I compare the CRCs of the audio.  Far too often the CRCs don't match.