If you need something like Dropbox that's not Dropbox, here are a few ideas
I love Dropbox. I've tried a few competitors — Google Drive, Box.com, SugarSync, SkyDrive (now OneDrive) — and I still use Box.com. But Dropbox is the only one of those services I'm willing to pay for. I just haven't found an easier, more reliable alternative for saving something on one doohickey and opening it on that other one over there.
All the same, Macworld's excellent Christopher Breen offers his thoughts today if you're looking for an alternative. One caveat: iPhone, iPad and iPod users might want to consider iCloud Drive — even though they won't get a gander at how it works until they see iOS 8, Apple's next operating system software upgrade due in the fall.