Even adb backup isn't possible: it's been deprecated for years and I've never ever gotten it to work even with root and the right dev settings. It starts creat

Even adb backup isn't possible: it's been deprecated for years and I've never ever gotten it to work even with root and the right dev settings. It starts creating an image of a couple of GB (takes a couple of hours, lol) and then just bugs out and stops. There's no error checking or anything and when it bugs out it means you have start all over again.