As we know Clockwork Mod has already announced its Carbon backup app but now they has launched new Cloud App which supports DropBox also. Full Changelog of Clockwork Mod Carbon Beta 2:
Dropbox support
Save Groups/batches of apps
Select All apps for backup
Backup app data only
Fixes:
Backup/restore window now only pops up once, instead of once per app.
“Backup now” and “Restore now” button is now automatically pressed.
Couple of days ago Koushik Dutta, founder, developer at Clockwork Mod said that Carbon will get Dropbox option in recent updates soon but they have finally launched new app. So guys now with SD card option now you also have to save backup to Dropbox directly.
Download Now New Carbon App.
Source: Koushik Dutta