Click ok and then well go ahead and erase the disk

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Click OK, and then we'll go ahead and erase the disk, and it's done. Let's close the Disk Utility and open up Time Machine using Spotlight. Since we haven't configured it yet, we're asked to select a backup location. Click Setup Time Machine. Turning On Time Machine 2:22-4:26 Here's the Time Machine tool. Notice it tells us that Time Machine keeps hourly backups for one day,daily backups for a month, and weekly backups for all previous months. Let's go ahead and select our backup disk.
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There's our disk, and notice the option to use the Apple Time Capsule. If we had one configured, we could use that option, but we're going to use our external drive. We also have the option to encrypt backups. This is a good idea, especially when using a portable external drive that can be easily lost or stolen, but encrypting the drive also increases the time it takes to read and write from the disk, so for our purposes, we're not going to use this option. Click Use Disk, and Time Machine is now configured and turned on. We can further configure Time Machine by clicking Options. Here we can decide whether or not we want Time Machine to back up while on battery power, change our notification settings, and we can also exclude specific folders from being backed up. By default the Time Machine drive itself is excluded, and for good reason. We probably don't want Time Machine to back up Time Machine, but let's say we have a folder that we don't want to back upfor whatever reason. Let's create a folder on the desktop called Do Not Backup. We'll go back to Time Machine, and click the plus here. Go to our desktop, select the folder we just created, and click Exclude. Now, Time Machine will ignore this folder. Anything we put in there won't be backed up. If we decided we wanted to back up this folder, we could select it and click the minus to remove, but we want to exclude this folder, so we'll click Save to save the changes. We also probably want to see the Time Machine status, and be able to access it easily, so let's select the option to show the Time Machine icon in the menu bar, and we can see it here. Now when you configure Time Machine for the first time, it'll take a while to back up the entire file system for the first time. After that's done, backups shouldn't take very long at all, but know that until Time Machine has done the initial backup, not all of your files will have backup states. That's it, Time Machine has been set up, and the system will now automatically create backups of everything on the system. Summary 4:27-4:41 That's it for this demonstration. To review, we looked at setting up Time Machine to back up files, folders, and the entire system. We started by selecting a storage device, formatting it using the HFS Plus file system, and then starting and configuring Time Machine to use the storage device and back up the system.
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