Help with Differential Backups

First, let me say that I think Toucan is great! My un-compressed folder of 'synched' backup files went from 300+MB to ~100MB.

Second, I have been searching the support forums and the help files for answers but haven't found all of the answers to my questions. So I apologize up front if I didn't see that my questions have already been asked and answered.

Given:

• Toucan PE version 3.0.4 running from C:\PortableApps folder
• Windows 2000 SP4, with Admin permissions
• Backup location is a mapped network drive, with separate folders to keep the BaseFile's separated
• 3 Backup Jobs, set to Differential 7-Zip with Ultra Compression. Each have been run individually from the Toucan interface and they have each created a BaseFile.7z.

Questions:

1. Is there a way to clean up 'empty' differential backups? For example I tested the second run of one of the Backup Jobs. It ran and created 2011-06-17-09-21.7z but since there were no changes to the folder in question, Toucan created and 'empty' file.
2. I have the backup jobs scheduled individually via Windows Task Scheduler using the -j switch. I created a script using the Toucan script tab to chain the 3 jobs together and they run from the Toucan interface, but not when I try to launch via the scheduler command line. I used the following , but all I get is a command window that opens then closes before it displays anything.
   

   C:\PortableApps\Toucan\Toucan.exe -s Daily

   The same is true when attempting to launch from a command window.>