I have to stick this link up because if you click on it and make a Dropbox account I will get extra space in my Dropbox account.  I’ve used it for years now and never had an issue.  My documents transfer without worry between computers and since I format my computers often, I never have to worry about backing up the files in my Dropbox.  Once I re-install the app and log in they are all synced to the computer.  I use this on my Windows computers and Linux boxes.  I also have access to all the file in the Dropbox from my iPad and iPhone.

Here is another link if you missed the ones above.  www.dropbox.com