zebra barcode printer c# 18: Backup and Fault Tolerance in Objective-C

Generate Data Matrix ECC200 in Objective-C 18: Backup and Fault Tolerance

CHAPTER 18: Backup and Fault Tolerance
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is nothing more than a waste of time and equipment, right up until the time when it becomes critical to restore the data. Readers should get into the habit of testing their restoration process (and should document it if it's at all difficult) so that when the time comes, they know they can rely on their backups.
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Time Machine
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Time Machine is an application introduced in Mac OS X Leopard that allows you to back up your computer to a second hard drive at set regular intervals. Time Machine is a straightforward application that is simple to configure. However, it is a new feature of OS X and is fairly limited in its granularity and flexibility. The good thing is that Time Machine is installed by default on every new Mac, so you don t need to purchase any additional software. To set up disk-based backups using Time Machine, open the Time Machine Preference pane (see Figure 18 1).
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Figure 18 1. Time Machine preference pane
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Next, select the target device for your backups. This is where the data that is backed up on your computers is stored. To do so, click on the Select Backup Disk button and then select the device you want to backup to. Once you are satisfied with your selection click the Choose Backup Disk button (see Figure 18 2).
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CHAPTER 18: Backup and Fault Tolerance
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Figure 18 2. Choosing the backup device
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Once you have selected the target disk, the screen will change to reflect the critical statistics of your backup operations (see Figure 18 3). Here you will see the volume you are backing up to, how much available free space is on that volume, the date and time of both the oldest and most recent backups, and when the next backup is scheduled. For many smaller backup environments, this information is the most crucial to track. NOTE: Knowing which volume you are backing up to means that you know where additional copies of your data are. Sure this increases availability, but the backed up file now needs the same protection from theft and tampering that you applied to the master version. This is an important (and to many people, surprising) point: adding security countermeasures doesn't make a system more secure, it makes it differently secure. You have to consider risks affecting those countermeasures, which wasn't the case before they were deployed.
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Figure 18 3. Time Machine configured
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CHAPTER 18: Backup and Fault Tolerance
On this screen, you can also click the Select Disk button at any time to change the destination of your backups. This will allow you to fill up a disk and then move to the next disk in your backup scheme. Multiple disks can give you a deep historical backup set of your data, which is crucial if collecting multiple versions of files is important to your backup strategy. NOTE: Unfortunately the Time Machine workflow doesn't really support recovery from multiple disks, so different versions of files will end up strewn across the disks with no central catalogue to tie them together. You can also set what data on your computer will not be backed up. By default, Time Machine will back up all the data on your computer s hard drive. To limit what is backed up, click the Options button, and you will be presented with the Exclude these items from backup window (Figure 18 4). Here you can specify which items are to be excluded from the backup sets.
Figure 18 4. Time Machine device exclusions
Next, if you click the plus (+) button, you will be able to browse to folders that are not worth the space to back up. For example, most users do not need to back up the following directories unless they plan to do a bare-metal restore (a restore from a hard drive crash without reinstalling the operating system): /Applications /Library /System Invisible items (which are accessible by unchecking the Show Invisible Items check box) include the following: /.TemporaryItems
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