Help Backup photos



I recently reset my phone to try and fix a freezing issue. I have it set so all the pictures I take to go Dropbox, and I also told the phone to backup before resetting.

However, I now can't find my photos in either dropbox or Picasa and they haven't reappeared on my phone. The lock screen picture is still a picture from before I reset, so that must be somewhere, I just can't find them anywhere.

Does anyone know where they might be hiding?

Thank you