from http://bugs.musicbrainz.org/ticket/3513

Right now we have the option to turn renaming on/off and moving files on/off. I would find it very useful if Picard had the option to create copies of the original files in the specified location with specified filename and the new tags. In many cases, I prefer to keep the original source as is and manually copy an album before tagging it. I just think it'd be nice if this was a feature in Picard as I'm sure others would use it as well (for safe tagging of files, etc).