I’ve noticed I keep being given free space extensions in Dropbox. I’ve just realised all my photos are being uploaded there. That means I’m uploading to both Google+ and Dropbox, using wifi only.
I don’t mind this as long as Dropbox keeps extending the space. I’m not aware they provide unlimited storage aka G+ but hey. I did find a real use for Dropbox recently when my S3 battery stopped charging. The USB port was only intermittently visible & I couldn’t move files across the the laptop. I shifted some “important” stuff into Dropbox before the battery finally went and I now still have those files. I also used Google Drive.
It probably doesn’t make sense to use both but for the moment it’s easy enough to do and I haven’t hit any problems.