i've been "meaning to" build a proper backup system for a while. i've got like, maybe 100 GB of important stuff, and then the OS drives of my main PC/laptop. my idea is to build a NAS and set it up so that i can automatically sync stuff to it in case of drive failure.

i wanted to buy some 12 TB HGST drives last year but i didn't, and the price skyrocketed. now looking at it again, i can get these 10TBs for just under a hundred bucks each.

starting out, do you think it would be smart to just get two of them and mirror them? or should i get three? this will be redundant data, i should always have another copy somewhere, but this is intended as an important archive.

i really do not have 10 TB of shit, but i figure later on down the line i could set it up so my friends/family could get encrypted regions of the drive to put their own shit on so they can have offsite backups with me.

tl;dr is 2 enough or should i get more?