What Is The Best Free Online Storage Out There?

xdrive (which is run/owned by AOL i think) – seems to be ok but will create an aol e-mail account when opening an xdrive account. i do not need another e-mail account, just an xdrive account. I need the free online storage to keep all my files that I usually store on my PC but I think it’s safer to have it stored online and be accessible anywhere not just my PC.
any other good ones out there?