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Backing Up Windows Systems
Chapter 5170
NTFS 3.x
Filesystem
Features
The NTFS 3.x filesystem has introduced new file attributes and
concepts, which can be summarized as follows:
• 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
Backup
Volume Shadow Copy service (VSS) is implemented on the Windows
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.