Direct backup from Titanium Backup to DropBox Device: Samsung Galaxy S4, with root

I was wondering if it would be possible to make my backups straight to DropBox, without needing to save the files to my phone first. I had TiBu upload to DropBox after the backup, but TiBu cannot complete the backup because of the low disk space.

I was thinking of something like a symlink to DropBox, but I don't know if that is possible.
I don't think that's possible. TiBu syncs a local copy to DropBox.

What you could do is: 


Use / Buy an external SD card (64GB or less)
Go to System settings, open the Application manager, and Move to SD card TiBu


This way, it doesn't take up internal phone memory. (i.e. TiBu dumps its backup to the external SD card)