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Tivoli Storage Manager for UNIX Backup-Archive Clients Installation and User's Guide
Use a point-in-time restore to restore files to the state that
existed at a specific date and time. A point-in-time restore can
eliminate the effect of data corruption, or recover a basic configuration to a
prior condition.
You can perform a point-in-time restore of a file space, directory, or
file. You can also perform a point-in-time restore of image
backups. For more information see Backup Image.
Perform incremental backups to support a point-in-time
restore. During an incremental backup, the client notifies the server
when files are deleted from a client file space or directory. Selective
and incremental-by-date backups do not notify the server about deleted
files. Run incremental backups at a frequency consistent with possible
restore requirements.
If you request a point-in-time restore with a date and time that is prior
to the oldest version maintained by the Tivoli Storage Manager server, the
object is not restored to your system. Files which were deleted from
you workstation prior to the point-in-time specified will not be
restored.
Notes:
- Your administrator must define copy group settings that maintain enough
inactive versions of a file to guarantee that you can restore that file to a
specific date and time. If enough versions are not maintained, Tivoli
Storage Manager may not be able to restore all objects to the point-in-time
you specify.
- If you delete a file or directory, the next time you run an incremental
backup, the active backup version becomes inactive and the oldest versions
that exceed the number specified by the versions data deleted
attribute of the management class are deleted. See Chapter 8, Understanding Storage Management Policies for more information about the versions data
deleted attribute.
When performing a point-in-time restore, consider the following:
- Tivoli Storage Manager restores file versions from the most recent backup
before the specified point-in-time date. Ensure the point- in-time that
you specify is not the same as the date and time this backup was
performed.
- If the date and time you specify for the object you are trying to restore
is earlier than the oldest version that exists on the server, Tivoli Storage
Manager cannot restore that object.
- Point-in-time restore will restore files deleted from the client
workstation after the point-in-time date but not files deleted before this
date.
- Tivoli Storage Manager cannot restore a file created after the
point-in-time date and time. When a point-in-time restore runs, files
that were created on the client after the point-in-time date are not
deleted.
To perform a point-in-time restore from the GUI client, use the following
steps:
- Click the Restore files and directories to your system button
in the main window. The Restore window appears.
- Click the Point-in-Time button from the Restore window.
The Point in Time Restore window appears.
- Select the Use a Point-in-Time date during restore selection
box. Select the date and time and click OK. The point
in time that you specified appears in the Point in Time display field in the
Restore window.
- Display the objects you want to restore. You can search for an
object by name, filter the directory tree, or work with the directories in the
directory tree.
- Click the selection boxes next to the objects you want to restore.
- Click the Restore button. The Restore Destination window
displays. Enter the appropriate information.
- Click the Restore button to start the restore. The
Restore Task List window displays the restore processing status.
Note: If there are no backup versions of a directory for
the point-in-time you specify, files within that directory are not restoreable
from the GUI. However, you can restore these files from the command
line. To ensure that you can view and restore all existing files from
the GUI during a point-in-time restore, you must maintain the same number of
backup versions for directories as days you are restoring back to.
You can start point-in-time restore from the command-line client using the
pitdate and pittime options with the query
and restore commands. For example, when you use the
pitdate and pittime options with the query
backup command, you establish the point-in-time for which file
information is returned. When you use pitdate and
pittime with the restore command, the date and time
values you specify establish the point-in-time for which files are
returned. If you specify pitdate without a pittime value, pittime
defaults to 23:59:59. If you specify pittime without a
pitdate value, it is ignored.
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