I have a stack of old harddrives in external enclosures - as I upgrade (non-failed) drives, I buy another enclosure and then do backups that way. So far, over 30-years, it has proven to be more reliable than burned media (I have even had to help clients who had project source code succumb to "bit-rot" on their physical burned media, but I still had a project HD tucked away from 15-years prior)