That’d be a kewl thing to be able to do (if all you had was a backup file, & no machine to restore it to). If you did, you’d simply restore the project, then export individual/desired trax for use elsewhere.
Your inquiry implies you do not…hopefully there IS a way…but - sadly - I don’t know it.
Hence reinforcing the ages-old (yet largely ignored) wisdom of maintaining good data-backup practices…