Unlike Inbox.com's free 5GB of online storage that does not include backups unless you upgrade to the reasonably priced for-fee service,

Xdrive

...provides 5GB of free online storage with backups (but no email feature). Xdrive also provides a Microsoft Windows utility to allow the ability to drag and drop files between Microsoft Windows folders and your Xdrive folder.

I had an account with Xdrive during the first dot-com boom. They provided, I believe, around 100MB of free space back then. Then, they changed their model to fee-only and dropped the free service. I seem to recall being a paying customer for a while before dropping the service. I have not tried this dot-com 2.0 free Xdrive service yet.

UPDATE: I didn't realize it when I originally posted this info that Xdrive is now owned by AOL.