From the website:
Dropbox is a free service that lets you bring all your photos, docs, and videos anywhere. This means that any file you save to your Dropbox will automatically save to all your computers, phones and even the Dropbox website.Dropbox works with Linux, Mac, Windows, and mobile devices. It’s wonderfully useful for accessing your stuff and for sharing items (if you like) with others. The cloud makes flash drives seem so early-twenty-first-century.
If you’d like to try Dropbox, here is a referral link that will give you and me each an extra 500 MB of free storage.