How to check and restore data from external Time Machine backup

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Tutorial to check what Time Machine is backing up and how to restore data on an external hard disk.

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Time Machine is Apple's application for making backup copies of your Mac on external hard drives. In addition, these backup copies can be password protected so that no one can access our content and we have the option of restoring only a specific file or folder on our system, which is extremely useful and fast.

The operation of a Time Machine copy is as follows:

The first time we make a copy of Time Machine, the system creates on an external HDD an identical copy in structure, and complete, to the one we have on our computer. This means that later we can navigate through the folders manually as if we were accessing our internal disk.

After the first full copy of the system is made, Time Machine will do a secondary task: checking for file changes. That is, the system will be in charge of constantly checking all the files that are modified by us in X time (between each copy).

Every time a file modifies its creation date, associated with its modification, the system detects that it is necessary to make a copy of said file again and store it on the external HDD. So with each file that is modified.

Hard links are used to give that "appearance" that complete copies are made each time we make a system backup, although in reality, thanks to these links, we are accessing files that were copied a long time ago on the system.

Once the Time Machine HDD is full, the system will delete the copies of the oldest files, with prior notice to the user.

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License:
Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
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Productivity Orchard
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iMac
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