I get the error below when running Commvault v8 on a Windows 7 client trying to backup system state. I've opened a tech support ticket with CommVault, but after looking at it for several days, they say that it is an OS problem. The backup phase that fails is the backup of the system protected files. The text from the CommVault log is:6948 eb4 01/26 15:01:42 131913 FsBackupTw::BackupComponentTemplate[System Protected Files]() - ---------------------------------------------------------------->>>6948 eb4 01/26 15:01:42 131913 FsBackupTw::BackupComponentTemplate[System Protected Files]() - Failed to backup [System Protected Files]6948 eb4 01/26 15:01:42 131913 FsBackupTw::BackupComponentTemplate[System Protected Files]() - ---------------------------------------------------------------->>>6948 eb4 01/26 15:01:42 131913 FsBackupTw::DoSystemStateBackup() - Critical error detected in component [System Protected Files]. Failing system state backup6948 eb4 01/26 15:01:42 131913 ::UpdateOSInfo() - Updating OS Version information6948 eb4 01/26 15:01:42 131913 StaticUtils::GetOSType() - Running on 64-Bit Windows 76948 eb4 01/26 15:01:42 131913 StaticUtils::GetOSType() - Running on 64-Bit Windows 76948 eb4 01/26 15:01:42 131913 StaticUtils::GetOSType() - Running on 64-Bit Windows 76948 eb4 01/26 15:01:42 ###### AppIdInterfaceNet::getApplicationId Send response to client [ rPID=< 2664>, rTID=< 3384>, socket=< 756>, remoteProcessName=<AppMgrSvc.exe>, sRemoteClientnameMember=<nsabpbackup1>, Established=<Wed Dec 31 19:00:00 1969>, LastMessage=<Wed Dec 31 19:00:00 1969> ]6948 eb4 01/26 15:01:42 ###### AppIdInterfaceNet::getApplicationId Recieved response from client [ rPID=< 2664>, rTID=< 3384>, socket=< 756>, remoteProcessName=<AppMgrSvc.exe>, sRemoteClientnameMember=<nsabpbackup1>, Established=<Wed Dec 31 19:00:00 1969>, LastMessage=<Wed Dec 31 19:00:00 1969> ]6948 eb4 01/26 15:01:42 131913 PrintReport() - Component Method Status6948 eb4 01/26 15:01:42 131913 PrintReport() - --------- ------ ------6948 eb4 01/26 15:01:42 131913 PrintReport() - Registry Legacy Successful6948 eb4 01/26 15:01:42 131913 PrintReport() - System Protected Files Writer Failed6948 eb4 01/26 15:01:42 131913 Entering [CsSnapRequestor::~CsSnapRequestor]It appears to me that vss can only write to the same device the source data is located on in Windows 7.This is what I get for c:\ when entering the vssadmin command list shadowstorage:Shadow Copy Storage association For volume: (C:)\\?\Volume{9b551d86-c7e8-11de-8e78-806e6f6e6963}\ Shadow Copy Storage volume: (C:)\\?\Volume{9b551d86-c7e8-11de-8e78-806e6f6e6963}\ Used Shadow Copy Storage space: 8.314 GB (4%) Allocated Shadow Copy Storage space: 8.575 GB (4%) Maximum Shadow Copy Storage space: 9.496 GB (5%)We spent time looking at various causes involving vss, but everyting looks OK. vssadmin shows that the system writer is configured properly.vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool(C) Copyright 2001-2005 Microsoft Corp. Waiting for responses.These may be delayed if a shadow copy is being prepared. Writer name: 'Task Scheduler Writer' Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124} Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b} State: [1] Stable Last error: No error Writer name: 'VSS Metadata Store Writer' Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06} Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93} State: [1] Stable Last error: No error Writer name: 'Performance Counters Writer' Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2} Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381} State: [1] Stable Last error: No error Writer name: 'ASR Writer' Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4} Writer Instance Id: {d2940e7e-e2b1-4fba-9838-7b3fc8a1f170} State: [1] Stable Last error: No error Writer name: 'System Writer' Writer Id: {e8132975-6f93-4464-a53e-1050253ae220} Writer Instance Id: {be51ae70-3c0a-4af5-bd4e-8ff8dc1fb54b} State: [1] Stable Last error: No error Writer name: 'SqlServerWriter' Writer Id: {a65faa63-5ea8-4ebc-9dbd-a0c4db26912a} Writer Instance Id: {c95bf2fa-11b0-4da9-af71-1043b6cf051c} State: [1] Stable Last error: No error Writer name: 'MSSearch Service Writer' Writer Id: {cd3f2362-8bef-46c7-9181-d62844cdc0b2} Writer Instance Id: {409d76eb-d19a-4f88-ba70-cf8f96e4272b} State: [1] Stable Last error: No error Writer name: 'IIS Metabase Writer' Writer Id: {59b1f0cf-90ef-465f-9609-6ca8b2938366} Writer Instance Id: {f3013362-b99a-417e-a27c-20621d1e1948} State: [1] Stable Last error: No error Writer name: 'Shadow Copy Optimization Writer' Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f} Writer Instance Id: {fdfe9344-322f-4659-bfe1-6b85c54b9072} State: [1] Stable Last error: No error Writer name: 'BITS Writer' Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0} Writer Instance Id: {9a250499-dc09-4602-8058-3cdd3cfdd76e} State: [1] Stable Last error: No error Writer name: 'WMI Writer' Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0} Writer Instance Id: {2b1e79ff-8d36-4130-8846-777e264b605f} State: [1] Stable Last error: No error Writer name: 'Registry Writer' Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485} Writer Instance Id: {115134e9-3573-478b-b2ba-c8fe48b69666} State: [1] Stable Last error: No error Writer name: 'COM+ REGDB Writer' Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f} Writer Instance Id: {e093a2f4-e03c-4898-bd74-66c80feb8dee} State: [1] Stable Last error: No error Writer name: 'IIS Config Writer' Writer Id: {2a40fd15-dfca-4aa8-a654-1f8c654603f6} Writer Instance Id: {d55a6ef3-55b6-4bd4-b041-8afa7bd9d326} State: [1] Stable Last error: No errorWe've Log Name: SystemSource: NtfsDate: 1/26/2010 2:46:06 PMEvent ID: 55Task Category: (2)Level: ErrorKeywords: ClassicUser: N/AComputer: redactedDescription:The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume \Device\HarddiskVolumeShadowCopy14.Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Ntfs" /> <EventID Qualifiers="49156">55</EventID> <Level>2</Level> <Task>2</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-01-26T19:46:06.657755300Z" /> <EventRecordID>1041681</EventRecordID> <Channel>System</Channel> <Computer>redacted</Computer> <Security /> </System> <EventData> <Data> </Data> <Data>\Device\HarddiskVolumeShadowCopy14</Data> <Binary>0D000C000200380002000000370004C000000000020100C000000000000000000000000000000000BB001700360E060000000100</Binary> </EventData></Event>

Hi, According to the event log, please check if there is system files corrupted first. It's better to run the cmd.exe as administrator, and execute the following two commands: CHKDSK /R sfc /scannow After that, pleas let us know if there is corrupted system file. At the same time, you can try to backup your machine with the build-in backup function, you can try the following steps as a test.1. Open Control Panel ans start creating a backup from the Backup and Restore center.2. Select the Location in order to save backup data.3. Once you have chosen your location, you can now choose what to backup. let's shoose the option "Let me choose". Note: uncheck the option before the "Include a system image of drivers: Unnamed driver,".4. Now you can start your backup process. If this backup failed to work either, please feel let us know. If it works fine, you can use the build-in backup program to backup your system.I hope this can help you. John