External hard drive big enough to hold more than the entire memory of the computer. Keep everything you find valuable at least, or better yet back up the entire computer on there and update it regularly. Leave it unplugged from the computer between updates.
In other words, an offline backup of everything on your main computer.
Follow the 3-2-1 rule: 3 copies, 2 different mediums (second HDD + thumb drive, DVD-R, tape if you’re nerdy, etc) and 1 offsite (cloud, VPN tunnel to someone else’s NAS, etc)
YubiKey
Nas systems like Synology, u can store photos, files, or anything without public cloud services.
dedicated nas systems are pretty overpriced imo, often costing as much or more than the drives you put in them. much cheaper to build your own. depending on your needs, this can be as simple as a raspberry pi plus an external hard drive.
I have a usb ssd attached to my router.
If you are a pc enthusiast I’m going to say you need a sensor panel. I built one myself, 7" lcd display and driver board costs less then 30€ and the result is incredible. I always look at it for any sort of reason it has temperatures, FPS, cpu/gpu/ram usage, network bandwidth… I always know what’s going on!
