HP B6960-90078 NTFS, volume, Backup, Chapter, Features, junctions, Filesystem, Object IDs, sparse files, reparse points, VSS Filesystem, Backing Up Windows Systems

	Backup
	Backing Up Windows Systems
NTFS 3.x	The NTFS 3.x filesystem has introduced new file attributes and
Filesystem	concepts, which can be summarized as follows:
Features	• The NTFS 3.x filesystem supports reparse points. The volume
	mount points, Single Instance Storage (SIS), and directory
	junctions are based on the reparse point concept. See “Glossary” for
	details.
	• The NTFS 3.x filesystem supports sparse files as an efficient way of
	reducing the amount of allocated disk space.
	• The NTFS 3.x filesystem supports the Object IDs that are backed up
	by Data Protector along with other alternate data streams.
	• Some of the NTFS 3.x filesystem-specific features are controlled by
	system services that maintain their own data records. These data
	structures are backed up as a part of CONFIGURATION.
	See “Backing Up CONFIGURATION” on page 173 and “Backing Up
	the Windows 2000/XP/Server 2003 Services” on page 179 for details.
	• The Microsoft-encrypted NTFS 3.x files are backed up and restored
	encrypted, but their contents can only be properly viewed when they
	are decrypted. Refer to the HP OpenView Storage Data Protector
	Software Release Notes for details about related limitations.
VSS Filesystem	Volume Shadow Copy service (VSS) is implemented on the Windows
Backup	Server 2003 operating system. This service provides an additional
	Windows filesystem backup, where the level of data integrity is slightly
	increased compared to traditional backup of active volume.
	To prepare for creation of the shadow copy, all I/O activity is stopped by
	the VSS mechanism. When the shadow copy is created, Data Protector
	starts its normal backup procedure, except that the source volume is
	replaced by the newly created shadow copy. If the shadow copy creation
	fails, Data Protector can proceed with the normal filesystem backup, if
	the Allow Fallback option was specified in the backup specification.
	During the VSS filesystem backup the consistency of data is improved in
	comparison with the non-VSS filesystem backup. VSS allows you to
	create shadow copy backups of volumes and exact point-in-time copies of
	files, including all open files. In this way, the files changed during the
	backup are copied correctly.

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