These writers are an essential part of the operating system. When they are not available the backup will complete successfully but the data for those writers will not get backed up to the IBM® Tivoli® Storage Manager server. This can result in the computer not booting after a restore of the system state.
System state backup stopped.
Verify that these writers exist using 'vssadmin list writers' command. Try the operation again. If the problem persists, contact your system administrator or IBM Tivoli Storage Manager administrator for further help.