10tb fits on one disk though - it may not be trivial but it's not overly complicated setting up a raid-1. Off-site redundancy and backup of course does make it more complicated however.

And all of those things are more steps than "buying a computer".

Reminds me of the "Dropbox can be built in a weekend"

You can buy a 10TB+ external drive which uses RAID1.

You can also buy a computer with this — not a laptop, and I don't know about budget desktops, but on Dell's site (for example) it's just a drop-down selection box.