It may be helpful. Consider online backups for your important digital documents

[pier4r]

But even if they are taken offline?

If they are online I have no doubt that USB, HD, SDD can last for a while (maybe the HD being the ones with shorter life spans. The average I have seen over time is around 4-5 years rotating 24/7 while used in raid systems). But offline I don't know.

Of course I am not thinking about proper packaging in electrostatic bags with anti-humidity bags and co. That would help a lot. I rather mean a simple action: take the HD/USB/SDD and put it in a drawer.