For digital storage, do you have everything you need backed up on an SD or micro-SD card? Small, relatively rugged and you can tape one or two inside your 1” binder. All you need later is a compatible PC.

A lot, not everything, can be placed on a USB drive. Either way, hard copies are needed because no one knows what will happen. Something can happen to hard copies. No matter how you look at it, a minimum of two types of copies is needed.