If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ...

System Center Data Protection Manager 2012

1) If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering data in the future, and replace this certificate with a valid certificate in the DPM backup certificates collection to continue further backups.
2) If this certificate does not contain a private key, replace this certificate with a valid certificate in the DPM backup certificates collection to continue further backups.
See "How to Encrypt Data in a Protection Group " in DPM Help for more information about certificates.

If the volume is present, this problem can be rectified by refreshing the state using the Get-Datasource -ProductionServer ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this certificate contains a private key, move this certificate to the DPM recovery certificates collection for recovering ... If this library is associated with an active protection group, modify the protection group to associate it with another library ... If this library is associated with an active protection group, modify the protection group to associate it with another library ...