Edit

IVssCreateExpressWriterMetadata::SetBackupSchema method (vswriter.h)

  • Article

Used by an express writer to indicate in its Writer Metadata Document the types of backup operations it can participate in.

Syntax

HRESULT SetBackupSchema(
  [in] DWORD dwSchemaMask
);

Parameters

[in] dwSchemaMask

A bitmask of VSS_BACKUP_SCHEMA enumeration values that specify the types of backup operations this writer supports.

Return value

The following are the valid return codes for this method.

Value Meaning
S_OK
 Successfully set the failure message.
E_INVALIDARG
 The backup schema argument is not valid.
E_OUTOFMEMORY
 The caller is out of memory or other system resources.
VSS_E_INVALID_XML_DOCUMENT
 The XML document is not valid. Check the event log for details. For more information, see Event and Error Handling Under VSS.

Remarks

If no schema is explicitly set by SetBackupSchema, the express writer will be assigned the default value of VSS_BS_UNDEFINED. VSS_BS_UNDEFINED means that the writer supports only simple full backup and restoration of entire files (as defined by VSS_BT_FULL), there is no support for incremental or differential backups, and partial files are not supported. Only the VSS_BS_UNDEFINED, VSS_BS_COPY and VSS_BS_INDEPENDENT_SYSTEM_STATE backup schema types are supported by express writers.

Requesters call IVssExamineWriterMetadata::GetBackupSchema to retrieve a writer's backup schemas as set by SetBackupSchema.

Requirements

Requirement Value
Minimum supported client Windows 7 [desktop apps only]
Minimum supported server Windows Server 2008 R2 [desktop apps only]
Target Platform Windows
Header vswriter.h (include Vss.h, VsWriter.h)
Library VssApi.lib

See also

IVssCreateExpressWriterMetadata