A while ago, my brother was locking something up and wanted to make sure that he didn’t lose the key. I had the bright idea of taking a photo of the key, since in the very worse case you could get a key blank and a hand file and carve out a copy of that key…and my photo archive is much better organized and backed up than my garage will ever be.
Now there’s a service online that will make you a copy of a key from a photo of it. No fuss. No muss. $5.