[mfincham]

"Further, the image file as well as its metadata would be backed up to your own little piece on the cloud"

Doesn't seem like much of a backup to me... I'd hope at the very least that even if there isn't a local storage option they would build it to support other peoples "cloud storage" products.

[adsahay]

This is something we're debating. If suppose data was to sync with a folder on your Dropbox, we can't guarantee its integrity should you decide to remove or move it, whether accidentally or intentionally. This isn't unsolvable, but definitely something to think about.