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Chapter 12: Tips, Techniques and Strategies
169
Restoring volumes for a specific date
You can restore volumes and directories as they appeared on a particular date as long as that date is
within the full data recovery period. Recall that the full data recovery period is the number of days prior
to the data loss for which any and every file backed up can be recovered. (To restore volumes to the last
backup date, refer to
Restoring volumes for the latest date
above.)
Different schedules provide full data recovery periods for varying numbers of days prior to the last
backup. For example, a GFS 30-tape job can reconstruct the data for any day of the past three weeks,
while a simple 4-tape backup only provides for reconstruction of the past two days.
You can reconstruct the data for any particular day during the full data recovery period. Consider this
example. Suppose you want to restore a particular volume as it appeared on Wednesday morning.
Providing the date falls within the full data recovery period, there are three possible scenarios for
restoring the volume as it appeared at the beginning of business on Wednesday: either (1) restore from a
full backup tape; (2) restore from a full backup tape and the most recent
differential
tape; or (3) restore
from a full backup tape and all of the
incremental
tapes from the previous full backup and the date in
question.
•
If you ran a full backup job the previous evening,
you can run one restore job. Begin by creating a
new restore job and selecting the appropriate volume on the selection page of the restore job. Initially,
the latest version of these files will be selected. You must select the versions according to the desired
date, in this case the Tuesday before the Wednesday. To do so, set the
Backup range
filter to the
desired date. Begin by clicking the
Selection Filters
button on the toolbar of the restore job’s
Selection
page. The
Selection Filters
dialog box will appear. Then click on the
Browse
button next
to the
Backup Range
field. Specify Tuesday’s date as the starting and ending date in the
Date Range
dialog box.
•
If you ran a differential job the previous evening,
you need only run two restore jobs. The first restore
job must restore all of the files from the previous full backup job; the second restore job must restore
files from the previous evening’s differential job.
Suppose in this example that the last full backup was done on Friday evening and that a differential
job was run on Tuesday evening. To restore files as they appeared on Wednesday morning, follow
these steps.
First, create a restore job, select the appropriate volume and then set the
Backup range
on the
Selection Filters
dialog box to match Friday’s date. Name the job with an appropriately identifying
name, such as
Restore from Friday’s Full Backup
.
Second, copy the first restore job, rename it with an identifying name and change the
Backup range
date to match Tuesday’s date.
Run the two jobs, being certain to run them in the proper order.
•
If you ran an incremental job the previous evening,
you will need to run two or more restore jobs. The
first job must restore all of the files from the previous full backup job; the other jobs must restore all
of the files from all of the previous incremental jobs between the full backup and the date in question.
Suppose in this example that the last full backup was done on Friday evening and that incremental
jobs were run on Monday and Tuesday evenings. To restore the volume as it appeared on Wednesday
morning, follow these steps.
a. Create a restore job, give it an identifying name, select the appropriate volume and then set the
Backup range to Friday’s date.
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