Time Machine does not copy the specified directory

OSX often uses timemachine to back up some files, and timemachine can make it easy to restore a folder to its previous state. However, the backup needs space, especially some of us do not want to back up some irrelevant files, such as movies, we can use the settings to ignore the development of the directory.
Setting (set) –time machine–options (option), then add the appropriate directory, as shown in:

This will automatically skip the specified directory when it is backed up.

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Time Machine does not copy the specified directory