The Xbox 360′s somewhat new cloud saving feature may be convenient for most games, but it’s not for Mass Effect 3. Mass Effect 3 does not support cloud saves from Mass Effect 2, so there’s a slight chance you won’t be able to play Mass Effect 3 using the data from your Mass Effect 2 save file. In most cases, your cloud save will still be usable, but you must have the original Xbox 360 the save file was created on for it to work.
EA outlined this somewhat confusing situation in a recent blog post. Here’s how it all works.
If you moved your Mass Effect 2 save to the cloud, it won’t import to Mass Effect 3. You have to move the save file back to the Xbox 360 from which it originated. This also has to be done if you’re moving your Mass Effect 2 save file from one Xbox 360 to another using the cloud.
If you’re using a different Xbox 360 to play Mass Effect 3 you have to move the Mass Effect 2 save file from the cloud and back onto its native Xbox 360. You then have to transfer that save file to your new Xbox 360 using a USB drive or Xbox 360 transfer cable.
Sorry to say if you don’t have the original Xbox 360 the file was created on, you’re out of luck if you moved that save to the cloud.