A cloud back up would be good; you might also consider a solid state external drive that you keep in a faraday cage/bag for added protection from any electrical interference that could cause problems. If your devices don’t already use solid state drives, you might consider upgrading, as they’re generally considered more reliable than the previous favorite, hard disk drives. and lastly; consider analog copies, at least for some of your data. Print your most valued pictures in an album, burn your favorite videos and songs to discs, etc. It’s much easier to archive physical objects, because they’re simply more stable than data, which has a teeny tiny chance to corrupt itself every time you access it. Electronics are also more delicate delicate, and if anything were to happen to your devices, analog copies might have a slightly better chance of surviving whatever happened to them.