If you do not have a FREE DropBox account, read the following.
DropBox keeps all the file synced to my iPhone, iPad, work computer, laptops, and home desktop. I change the file anyplace and it propigates to all other devices. DropBox is FREE for 2GB of data. I use it everyday.
They do have a referral program where the referrer gets an additional 250MB to get someone to sign up FREE. As my space is over 85% full, I need more space. The business model it once you are hooked, they will sell you large amounts of space by the month.
Here is my referral link: http://db.tt/T3QLXSj
Signup is quick and easy, you will really like this cloud service. And I get more free space. Please sign up.