Very true. The discussion helped me, as I did think it meant not easily editable.
As root of course you can change the system to be any other type of system (layer packages, rebase, whatever), but I did assume it meant not easily modifiable in it’s current state.
Any cloud is a secure backup on Linux if you use rclone crypt :)
It works with Google Drive, Dropbox, One Drive, and countless others to create an encrypted cloud storage, where the cloud provider can never view your file contents.