Event ID - 518

Event Id518
SourceMicrosoft-Windows-Backup
DescriptionBackup started at '%1' failed as another backup or recovery is in progress. Please re-run backup.
Event InformationAccording to Microsoft :
Cause
This event is logged when backup started failed as another backup or recovery is in progress.
Resolution
Stop conflicting backup or recovery operation
A backup operation can fail if another backup or recovery operation is running at the same time.
To perform these procedures, you must have membership in Backup Operators or Administrators, or you must have been delegated the appropriate authority.
Determine what operations are running
To determine what backup or recovery operation is running:
1.Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2.At the prompt, type: wbadmin get status.
Stop backup or recovery operationTo stop the currently running backup or recovery operation:
1.Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2.At the prompt, type: wbadmin stop job.
Verify
To verify that backup operations are running, or will run, successfully, you should do one or more of the following, as needed:
For any backup operations that you have run, look for Event ID 4, which indicates that the operation completed successfully with no errors.
Verify that no other backup or recovery operations are running so that you can start an operation
Verify that you have enabled a scheduled backup, and is configured correctly.
Verify that the location where you plan to store your backups is available and online.
To perform these procedures, you must have membership in Backup Operators or Administrators, or you must have been delegated the appropriate authority.
Verify the backup completed with no errors
To verify that a backup operation completed with no errors:
1.Open Event Viewer. Click Start, click Administrative Tools, and then click Event Viewer.
2.In the left pane, double-click Applications and Service Logs, double-click Microsoft, double-click Windows, double-click Backup, and then click Operational.
3.In the Event ID column, look for event 4.
4.For this event, confirm that the value in the Source column is Backup.
Verify another operation is not running
To verify that another backup or recovery operation is not running:
1.Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2.At the prompt, type: wbadmin get status.
3.If the command output indicates that no operation is running, then you can start a backup.
Verify scheduled backup is enabled
To verify that a scheduled backup is enabled:
1.Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2.At the prompt, type: wbadmin enable backup.
3.If the command output shows a schedule, then a scheduled backup is enabled.
4.Confirm that the schedule contains the correct parameters.
Verify storage location is online
To verify that a disk used to store backups is online:
1.For the computer that contains the storage disk, open Disk Management. Click Start, click Run, and then type: diskmgmt.msc.
2.Click View, click Top, and then click Disk List.
3.For the disk that contains the volume that you will use to store backups, confirm that the value in the Status column is Online.
Reference LinksEvent ID 518 from Source Microsoft-Windows-Backup

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