There are two Methods.
1) Stop the service of the database that performs the backup
Prepare a batch file to stop the service and start the service.
net stop <service name>
net start <service name>
Schedule -- Advanced Options -- Script to execute before the snapshot is taken:service_stop.bat
Schedule -- Advanced Options -- Script to execute after the snapshot is takenservice_start.bat
2) Take a cold backup
Please start from WinPE based or Linux based start environment and take a cold backup.