Ok, I don't have "unknown sources".. but I did discover my phone is now being backed up.. text messages, as of an hour ago. I believe it's going into Google Drive. How do I access this?

"Open Google Drive on your device and tap the three horizontal bars in the top left corner. In the left sidebar, scroll down and tap the entry for Backups. In the resulting window (Figure D), you will see the device you are using listed at the top as well as all other backed updevices."

"Backups" is not on my list..?