Hello! I’m the maintainer of Déjà Dup, a general purpose GNOME backup tool.
It would ideally have read/write access to any file on the system for backing up / restoring purposes. So classic seems like a good fit to me.
The :system-files and :personal-files interfaces don’t seem suited for this usage pattern (like, I can’t just specify :system-files of ‘/’ and get access to everything )