I backup all my home computers to my NAS and my work computer to an external drive. All my really important documents are also synced between all my machines wi

I backup all my home computers to my NAS and my work computer to an external drive. All my really important documents are also synced between all my machines with syncthing. I don't consider any of my data important enough to backup the NAS as well but if I did I'd probably use a second NAS at work.