Dropbox lets you automatically save your photos to your account. Turn on camera upload and send camera pictures to the account associated with your Android device, by doing as follows:
1. Open "Dropbox" application
2. Go to "Settings"
3. Tap "Turn on Camera Upload" to start copying the existing camera pictures to your Dropbox account
4. You can also tap "Upload Using" and specify whether to upload pictures using Wi-Fi Only or Wi-Fi or Data Plan