1. Make a copy of your profile, just in case.
2. Create a new file in your cloud server account.
3. Sync the restored backup file to the new cloud file.
4. Sync the profile to the same cloud file.
This will merge the two files, which will bring back the tasks that you mistakenly deleted since the backup. It will also restore any tasks you may have intentionally deleted since the backup.
-Dwight