Pre-/Post-command is a useful feature for those who need to run some application or execute commands (or batch file) before/after backup. You may start/stop certain Windows processes or other applications before/after backup procedure.
Note:
1. Don't set to execute interactive command, for the application will let it run in background. Unless you kill the command process in Windows Task Manager, the application will never start to back up.
2. If you want to execute a batch file or run an application in Command, make sure you have specified the work path of it.