Earlier quoted context omitted.
If you're an engineer and you know the implications of a "2-way sync" then yes. But most people using iPhone are not, so what happens when something is on/off has to be extremely clear and intuitive.
I'm not an engineer, but I've used computers often enough that I understand deleting synced folders deletes files in both locations (dropbox, onedrive, etc). > I'm resolving that for the future by swapping her to an Android phone where I can manage backups myself as I do for my own (a combination of Syncthing, ZFS, and off-site backups for me). So, rather than learn the implications of the setting and take the L in a…
First off, I am an engineer, and I've built my own two way sync services. I know what it is. What I'm complaining about, and you would understand if you read the words, is that the setting doesn't say "this way for backups, this way for two-way sync and oh btw we remove all message backups when you toggle this on".
Secondly your insinuation towards both myself and my girlfriend that this is a solution I forced upon her that she doesn't understand is insulting. She was extremely upset by the lost messages and perfectly happy to explore a different system where I could help her back them up in a way she trusts. And it's just plain sexist to assume she won't be able to manage them in this way.