Backup or restore operations that use the Microsoft SQL Server Virtual Device Interface (VDI) require that the server connection for SQL Server that is used to issue the BACKUP or RESTORE commands must be logged on as the sysadmin fixed server role. This may not be desirable in all environments and may cause third-party backup applications that use VDI to fail if the service accounts of the applications are configured to only have the db_backupoperator fixed database role. This is a design limitation in the current versions of SQL Server.
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