Important Music Disappears Without a setting to prevent it from occurring.

Will you at least create a setting that keeps you from removing the music from Mac? I show up to a gig where there is no internet connection or cellular service and the music I’ve purchased and checked to make sure that they are on my hard drive has been removed. What am supposed to tell a bride that has spent a fortune on a beautiful remote location? I’m sorry doesn’t cut it. Apple iTunes used to be the absolute best but I can no longer trust anything I “purchased” to be on my hard drive. Any suggestions other than use another service?