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Backing Up UNIX Systems
Chapter 5162
Data Protector provides a sophisticated mechanism for incremental
backups. To determine which files have changed, the Data Protector Disk
Agent checks when each was last modified. This method keeps Data
Protector from detecting moved files, as moving the file does not change
the modification time.
NOTE During a backup session, each file being backed up is opened and read.
Therefore, the access time of the file is changed after the backup. Unless
the Do not preserve access time attributes backup option is set,
the access time attribute is set to its original value. OFF is the default
value. If this option is set, moved files on UNIX clients are included in
the incremental backup, because detection is based on the inode
modification time.
Selecting Specific
Files or Directories
For each filesystem, you can restrict the backup to specific directory
trees. For each directory tree you can:
• Exclude any sub-tree or file
• Back up files that match a specific wildcard pattern
• Skip files that match a specific wildcard pattern
Some files are permanently in use, for example, by database
applications. These files should be excluded from ordinary filesystem
backup and should be backed up in a special way. This is also true for the
IDB itself.
Therefore, exclude the IDB directories /var/opt/omni/db and
/etc/opt/omni on UNIX Cell Managers from standard filesystem
backups to ensure the consistency of data.
For detailed information on how to back up the IDB, see “Configuring the
Database Backup” on page 398.
You should also exclude temporary directories.
How to Back Up
UNIX Files
Back up UNIX files using the procedure described in “Example of
Creating a Backup Specification” on page 155.
See also “Using Backup Options” on page 225 for information on using
and structuring your backup options.