When you sign up for free you get 10 gigabytes of storage completely free. You have to option to upgrade. Automatic backup.

Free 10GB storage. Can due automatic syncing with your phone and computer.

Photobucket is ok. It does well at allowing me to upload photos and store them. It gives you a decent amount of storage space for free. I like the privacy settings so you can store photos privately, this is especially useful while using it for business.