Ensure back-up role is installed.
- If not installed Add roles and features
- Under features select windows server backup. Then install
- Open windows server backup Tools > Windows Server Backup
Configure Backup
- Select the schedule backup option, ensure its every night outside of office hours
- Select full server backup. Ensure Bare metal recovery is selected.
- Under Specify Destination Type, select local drive.
- Select the external USB drive and click finish.