Jonteponte71B
A NAS is ”Network Attached Storage”. Basically a server for your home. First go to to synology.com and look for their consumer options and primarily their (included) software such as ”synology photos” and ”HyperBackup” and then go to the synology subreddit and search for ”DS423+” and/or ”DS923+” which should be your primary options unless you want to go cheap. There are several posts a day there from people contemplating those with a similar usecase as yours. That should get you started!
You might want to add what you are planning to run it on?
You basically do the other way around. Buy a NAS for your primary storage since it provides redundancy (RAID) and that you can reach it from anywhere. Then you attach external drives to it for one of the backups of the data from the NAS. The second copy should go to another physical place. The cloud or a friends house. It’s called a 3-2-1 backup strategy.
Add another mini PC off of ebay and you are golden. I’m running most of this on a Synology NAS with a much weaker CPU. It is not quick but OK. Unless you want to add much more than this it will be just fine.
I lived in a dorm room at uni. And we didn’t pay for electricity in the common areas. One christmas they turned off the heating for some reson. I got so frustrated I turned on the ovens in the kitchen and opened them up to heat the kitchen/living area. Which worked. But it was probably not cheap for them after a few days :)