Hmm, wouldn’t that be RAID 1? I thought RAID 0 was striping, where if a drive fails you are screwed.
It’s probably super unlikely, but I’d still be paranoid about that one day where your external drive is home and something happens (fire, flood, etc).
I did something similar until I went full remote. I just had two externals and would update one before going to work and take the out of date one back home.
Totally understand being distrustful of cloud storage. But there are a lot of great solutions that are end to end encrypted. I’ve had good luck with https://rclone.org in the past. They support so many cloud services, it’s insane. You can set your own encryption key.
I remember the art of crafting the perfect google search query and knowing you’d eventually find that obscure bit of info. Now I have to quote nearly everything in my query and if a single result in the first 100 results is tangentially related, I’m grateful.