Time Machine in macOS can automatically back up any volumes you have mounted on a Mac, except those you exclude. You control the exclusion list by opening the time machine's preference route and clicking Options where you can also add specific folder hierarchies that are displayed as paths. (To exclude your document folder, for example, click the + sign and navigate to it to select the folder, but it appears in the list as
~ / Documents where tilde means "your home directory.
You may notice that a few items are always greyed out, which are volumes identified as Time Machine backups, and usually display the Time Machine icon as the volume icon. Back up Time Machine volumes You can use third-party cloning or incremental backup software, such as Carbon Copy Cloner, ChronoSync, or SuperDuper, to create a separate backup copy.
It may seem a paradox that an item is listed in the exclusion list that You cannot exclude. However, Apple probably decided that it would be more confusing for to exclude to display these volumes because you might wonder why they are not appearing at all.
A side mystery for many will be
/ Users / Shared / adi item in the list. It's a folder Apple maintains regarding the App Store. Why should it be excluded? None of Apple or online tinkerers can explain.
This Mac 911 article is in response to a question from Macworld reader Kristen.
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