I logged into the web interface and looked around, but see no reference to the trashbox. So, I went to the Shared Folder in question, Shared Folder Support, and unchecked the Disk Backup box. Then, I deleted the trashbox folder from the Shared Folder. I then ran a test backup job and a trashbox folder was not re-created. I will continue to monitor, but it looks like I'm good to go. Thanks for your help!
-Bill