Location: Options > Advanced > Pre/Post commands

You can specify commands (or even batch files) that will be automatically executed before and after the backup procedure.

For example, you may want to start/stop certain Windows processes, or check your data before starting backup.

To specify commands (batch files):

Select a command to be executed before the backup process starts in the Pre-command field. To create a new command or select a new batch file, click the Edit button.
Select a command to be executed after the backup process ends in the Post-command field. To create a new command or select a new batch file, click the Edit button.

Please do not try to execute interactive commands, i.e. commands that require user input (for example, "pause"). These are not supported.