Backing Up with the Enterprise Manager 
Use
The SQL Enterprise Manager allows you to backup the entire database or the transaction log on its own. SAP recommends the use of the Enterprise Manager for individual, exceptional backups that are not part of the normal backup routine.

For backups that are scheduled periodically, in accordance with a predefined backup strategy, it is advisable to use the R/3 CCMS Planning Calendar. This offers a range of useful functions for scheduling backups and easy access to other R/3 transactions that let you monitor backups.
Keep in mind that a backup scheduled and executed in the Enterprise Manager is not recorded in the R/3 Planning Calendar.
Procedure
Executing a Backup
The SQL Server Backup dialog box appears.
Database Complete backs up the entire database including the data and log files. This type of backup does not truncate the transaction log.
Transaction Log backs up the transaction log only. The procedure includes the truncation of the log.
Differential backs up only the changes made to the database since the last full database backup.
The Edit Schedule dialog box appears.
One Time schedules the backup to run once. Set a date in the On Date box and a time in the At Time box.
Recurring schedules the backup to run at regular intervals.
To specify the details for the recurring backup, choose the Change button. You can then enter information in the Task Schedule dialog box that opens.

Always choose Verify Backup on Completion as this makes sure that all the files are written to tape and can be read.
Monitoring the Backup
A backup that has been scheduled is executed as a job by the SQL Server Agent. To monitor a backup that is currently running, you have to access the SQL Server Agent that is responsible for executing scheduled jobs.
The right-hand pane displays an overview of all scheduled jobs.

Backup tasks scheduled in the Enterprise Manager are not registered in the R/3 Planning Calendar.