Blast from the past, but might be useful. Sun tentatively made a computer that ran from cdrom, as TAILS does. The OS was immutable. You could store files on ext

Blast from the past, but might be useful. Sun tentatively made a computer that ran from cdrom, as TAILS does. The OS was immutable. You could store files on external media. Presumably, have those backed up in time-machine fashion, so as the be able to recover lost files, rather than a snapshot backup. What a struggle computers are. I am old as dirt but supposedly on top of things. Apple Mail.app forgot my sender address and kept asking me for a "hide my email" From: address. Being a propeller-head, I found it and fixed it. What a fright it must be when things go bonkers and you have no clue. I don't recall where user settings go on a cdrom OS. Perhaps on a separate home partition or overlay on removable RW storage. Can't speak for phones.