backups to a server are more complete than ota backups. usb backups are more reliable than wifi. That said, you're generally fine with ota. I do local backups for peace of mind.
I upgraded my daughter's 5 with 1.5gb free
Also, YouTube works fine on my 5s
Edit: not embedded, good catch crap, and odd.
Edit 2: embedded obeys the mute switch.