[toomuchtodo]

LTO tape (specifically that which is rated for 15-30 years of archival storage) with the drive. The tape is usually rated for a couple hundred full passes, which should more than meet your needs if you're writing once and sticking them somewhere safe.

SSDs don't have this archival longevity yet, and hard drives are better when powered up and the data is always hot for scrubbing and migrating when indicators of drive failure present.

[sliken]

I believe it's 15-30 years for archival storage, if you regularly unspool and respool them to avoid print through.

[einpoklum]

Don't LTO tape drives cost about a zillion dollars each?

[toomuchtodo]

I recommend acquiring them second hand (but validated) for personal use.