zebra barcode printer c# Figure 18 23. The Backup Assistant summary screen in Objective-C

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Figure 18 23. The Backup Assistant summary screen
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Alternatively, you can also click on the Schedule button to configure the script to run automatically. Here, you can instruct the script to run daily, weekly, or monthly. You can also choose the time that the script will run and the set that the script will back up to. As Figure 18 24 shows, there are a number of options in the schedules, and strategies behind the use of each one. For example, when automating the weekly rotation of backup drives or tapes you can use the Every field to select that a scheduled instance of a script run every two weeks. You can then create another scheduled instance of the same script for the other weeks. Each would have a different set, which would allow for the routine swapping out of drives.
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CHAPTER 18: Backup and Fault Tolerance
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Figure 18 24. Scheduling a script in Retrospect
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Once you have scheduled your backups then it s time to consider utility scripts or grooming scripts to keep your backups running lean and mean.
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Grooming Scripts
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Retrospect backup scripts use snapshots. So as an example, if you were to do a backup without a recycle 20 times, then you have 20 snapshots. If you changed a 1GB file every day, then you d have 20GB occupied by that one file. Now let s say that you groom away 10 of those backups by setting a grooming policy of 10. You d now only have 10GB used by that file. So any file not required for the 10 last backups will be removed from the disk based backup set when the next grooming script runs. Any time you have sets that grow and you don t want to recycle them, you re going to want to use some kind of grooming script. And why wouldn t you want to recycle them For the simple reason that, right after the recycle event, you d have a potential point of failure where you wouldn t have a copy of your data. You re mitigating risk by having multiple sets with the same data. One of the things consistent about Retrospect for Windows over the years is the ability to groom a backup set. Grooming is essentially taking the old data that doesn t need to
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CHAPTER 18: Backup and Fault Tolerance
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be in the set and removing it, providing there s still a copy of the file still resident on the source. In the Scripts section you can add a Utility Script. In this case, we ll select Groom. You then check the box for each set you d like to groom using this script and set a schedule. See Figure 18 25.
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Figure 18 25. Configuring Retrospect 8 grooming scripts
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Next, you ll want to go into your sets and configure a grooming policy. To do so, click on Media Sets and then click on the set you d like to set a grooming policy for and then click on the Options set tab. Here (as you ll notice in Figure 18 25), you ll see an option for No grooming (the default) or the number of backups to keep. By telling Retrospect to retain Retrospect 6 or 7 backups for a given set, you are eliminating the need to do an occasional recycle script, unless you d like to continue to use the same script architecture you used in previous versions. You can also tell a given set to use the global grooming policy. Overall grooming is a requirement for modern backup software. If you haven t updated from previous versions of Retrospect, then his feature alone will cut down considerably on complexity and annoyance for many organizations that has plagued Mac admins over the past few years. While grooming is nice, we d be lying if we said it didn t have its drawbacks. Keep in mind that it has a history of causing corrupt catalog files in the Windows version of the software, an issue not as prevalent in the Mac OS X version of the software. So make sure to backup your catalog files. Also, be very careful stopping grooming scripts when they re running. This can cause corruption, and cause your catalogs to require a rebuild.
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