Thank you, everyone, for all the good insights and factual information. Very informative.
I'm in Minneapolis, Minnesota USA and haven't received the update yet. I'm on WP 8.0. I am backing up TV Blaze, checking to see if my Camera Photos actually all backed up to OneDrive. I know 8.1 loses the XBox Music And Video (and podcast) Hub, so I am taking screen shots of my podcast list. (Wow, I miss the ZUNE functionality (in Windows Phone 7.0.) I hate that Xbox (formally the amazing Zune) gets worse and worse with each change in OS.). Is there anything else I should be backing up or saving an image of, in preparation of Windows Phone 8.1 OS?
Happy Holidays!