If you record over a track, you can open the backup file, select the old (good) track and use 'track-save track to file' command.
Then open your new seq file and use 'audio- import wav file' to bring the good track back into the new project.

To open the backup files you would use the 'FILE' pulldown, then load backup.

I do not work here, but the benefits are still awesome
Make your sound your own!