GoodSync lets me back up the changed files on my Mac Hard Drive to cloud storage without having to keep them in a dedicated cloud folder. Since the Mac is networked, it lets others be able to access my files as needed. It's easy to select the files to sync, and reasonably easy to select and log on to a cloud account. The only problem I've had is it very rarely loses the cloud location or starts a completely different set of folders in the cloud (duplicating my data). I've also used it as a sync to keep critical files synced between my home & work computer. The program is very versatile and easy to use, and doesn't seem to mind that I'm syncing between different OS.