I’ve set up a self hosted photo system with immich, and it works doing automatic backups of photos from the filesystem, eg using termux/cron, although it is a bit flakey. Immich also works for backup, but it’s less ideal.
iPhone seems to be a lot harder, backup in immich doesn’t work, it seems that iPhones have a complicated was of handling background tasks which make background backups very difficult.
Does anyone know a way of doing any kind of backup automatically, without plugging in a cable and without using iCloud?
You are right, it can indeed sync fotos. But due to the nature of iOS, it can not do full system backups (but no app from the App Store can do that) If all you want to backup are fotos, then it can do that.
Sure, I get that. Not kicking you in the cods, I just understood OP’s request was related to photos. No worries, all good.