I explained that they ought to be recipes to new media every N number of years or risk deteriorating or becoming unreadable

This is important, and for some media, it should be more often than that.

People forget that flash memory uses electrical charge to store data. It's not durable. If left unpowered for too long, that data will get corrupted. A failure might not even be visible without examining every bit of every file.

Keep backups. Include recovery data (e.g. PAR2). Store them on multiple media. Keep them well-maintained (e.g. give flash drives power). Mind their environment. Copy them to new storage devices before the old ones become obsolete.

It's funny that with all our technology, paper is still the most durable storage medium (under normal conditions) that doesn't cost an arm and a leg.