Depending on how long it is stored, bit rot could be a serious problem. For longevity, spinning rust, magneto-optical, or optical.
Streaming rust degrades severely outside of strict temperature/humidity standards. I had Boeing send me a tape that had been “archived” for 15 years. Opened the box and started to pull some off the reel so I could thread it onto the drive… and all the rust just fell off. Total data loss. When I asked, I found that those 15 years were in an un-airconditioned conex out on the tarmac in Long Beach. Brilliant!