Ok, you do have (kinda) a point with Dropbox since they store the file locally on all computers.
What I'm saying though, is that the cloud storage (not local) can be decoupled from the service. Such that if I decide I don't want to use Dropbox anymore, I still have a access copy of my files in the cloud - just not via the Dropbox software.
Imagine if Dropbox sync'ed your local files with your personal Amazon S3 bucket. That's what I'm hinting at.
What I'm saying though, is that the cloud storage (not local) can be decoupled from the service. Such that if I decide I don't want to use Dropbox anymore, I still have a access copy of my files in the cloud - just not via the Dropbox software.
Imagine if Dropbox sync'ed your local files with your personal Amazon S3 bucket. That's what I'm hinting at.