I haven't worked with any other manufacturers' but I imagine they have similar "factory tools" that you might be able to find online.
Most don't. If you have an Apple product, they'll just tell you to use iCloud. All the big Android brands will tell you a similar story (use Google Drive, Dropbox etc...) to back up your data. The cheaper Android's are quite easy* to get entire memory dumps from, you might even be able to do this via ADB commands.
For phones like Samsung even uploading a custom boot loader can trip the Knox lock rendering your manufacturer's warranty void and inability to use Samsung Knox features like secure payments etc...
For newish iPhones (from memory, iPhone 5 onwards), they encrypt data by default and each file has its own individual 256-bit AES encryption key. Once a file is "deleted" that key is destroyed which renders that file completely unreadable and unrecoverable. The
IOS Security Guide is a good read if you wanted to learn more.
* "Easy" as in inexpensive and simple for a technically-minded user, not "easy" in that any average user would be able to do it.