Firstly...Heya!
Secondly, a question about the XBL cloud. Do you have to have a Gold Membership to use it, or can the freebie membership be used with it?
Thankfully, I have so many damn cards floating around this house (gracias, husband of mine....
), so backing up with the thumbdrive still works well for me. However, having another way to save, is never a bad thing. Yup!
Since you talk about XBL, then I offer out my Gamertags: "coldwetn0se" and "FlattestFlea726". The coldwetn0se account has my newest Arisen/pawn, at level 55 currently. The flattestflea account has my max out infinity Arisen and pawn.
I think you will have a blast in BBI; new story and lore, great enemy types, fantastic loot. It's a bit like the Everfall on 'roids. 
I'm honestly not sure if Cloud is available to Silver members, but I would guess that it's probably not.
I did play most of BBI last year, before my file was deleted. I know I killed the big eye thing, the Elder Ogre, the Bishop, and experienced much frustration with the surprisingly difficult enemies! But I'm guessing I was about 2/3 to 3/4 of the way through, since I had unlocked both alternate entrances to the dungeon from the island's surface.
My GT is the same as my ID. I just have the one character. The pawn is Ariana (Ari with the language lock turned on.) I developed a reliance on having a party healer while I was playing the vanilla version of the game, and grew frustrated at the inability to find one I liked online (or among the stock pawns, for that matter.) So, after I levelled my pawn through all the careers, I settled on making her a healer/mage. To that end, she's not very offensively powerful, but she is a highy utilitarian character.
She is a Guardian Mendicant, so she defaults to using her powers as her stamina returns. That can be a problem with the Everfell, or BBI, but she's well-designed enough to work in a high level dungeon, even if her damage output will be a little lower. The upside is that she can carry extra weight, and rarely uses consumables, so it's safe to make her the party's backpack, storing whatever I need on her.
She has the max bonuses for both types of damage reduction, magic, and the speed and knockdown bonuses for spell intonation. Also, she looks like Leia from Jabba's palace, which is the coolest thing about her! ;D