Yes, Backupmenu saves everything. You get it from the extras-devel repository, which is available to all users.

CSSU has a "stable" version now, so it should work fine for you. I don't think it is essential, frankly, but it is safe. If you pine for programs to switch from horizontal to vertical display, CSSU is the way to go. It was never particularly dangerous even before it became stable, in my experience.