I got called to a 12 year old server with a failed HDD once. They said no problem we have a daily backup. Just put in a new drive and restore from tape.
The tape wouldn’t read. I took it out of the drive and noticed some brown specs and dust falling out. The tape was clear, like scotch tape. They backed up daily to the same tape for over 10 years without verification. The remnants of the magnetic layer was scattered inside the drive. That client became pretty sad pretty fast.