If you set up a vbscript that does the actual backup on the machine running IIS that does the backup, you can set up a trigger in visualcron to get it and put it in the server of your choice. To me, it looks like 1 visualcron task:
A job with a trigger that gets set when the backup file gets created.
This job runs one task that copies the file from the IIS server to whatever server you want it to go.