Download history:
From your profile you can download a json file of your event history. Not sure if this effectively backups, is it your timeline? If someone know, please reply.
Discussion
Layout switching:
You can choose between multicolumn, instagram, twitter, pinterest layouts.
Feed modes:
Global feed.
Following feed: Show notes by following, or by what's recently liked (COOL).
Friends+ : People you follow and the people they follow (also cool)