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