Bitcasa supports syncing with other drives on your computer in real time. Bitcasa also bills itself as a way to do away with your existing backup devices. Bitcasa will not let you sync a network drive to the cloud, although you can copy the contents with a single mouse click. You can, however, sync an external drive. You can share your content with others by creating a URL that can allow them access to a folder or a file. Overall, Bitcasa is fast, effective, reasonably priced and highly flexible.