Windows Server Backup has detected that the selected backup destination {0} contains backups taken with a previous version ...

Windows Server Backup has detected that the selected backup destination {0} contains backups taken with a previous version of Windows. Performing a new backup to that destination will erase these backups. If you want to retain these backups you should copy them to a new location before using this location as the current backup destination or use a different backup destination. To confirm that the previous backups can be deleted run the backup job using the -AllowDeleteOldBackups parameter.