Well, there’s DropBox.com, Copy.com, Google’s Cloud, Apple’s Cloud… and gawd knows how many more places there are to store your stuff on there on someone else’s server.
Of course, if you happen to have your own server, or FTP access (or a bunch more protocols*) there’s one more possibility: ExpanDrive, at expandrive.com .
With it, you can mount pretty much anything as a standard drive would mount, on your desktop.
So you can drag-n-drop to it, or you can use CarbonCopyCloner (et al) to backup up files to it.
And, like DropBox-n-More, if you have ExpanDrive on your other computers (like your laptop) – well: Bingo! the drive appears there too, so you can move files around at will.
Other than the cost of the software, there are no fees associated with it, and the storage you use is entirely up to you.
BTW, ExpanDrive makes doing websites much easier too.
Been using it for years now. The developer is conscientious and the software “just works.”
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* ExpanDrive works with:
SFTP
FTP
Amazon Se
WebDAV
Rackspace Cloud Files
OpenStack Swift Storage
Dreamhost DreamObjects
Box.com
Dropbox
Google Drive