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I typed 

sudo tmutil listlocalsnapshots /

in terminal and entered the password. However, nothing happened. I suppose terminal to return all local snapshots on my computer, but it only returns xxxs-MacBook-Pro-3:~ xxx$. Does that mean there is no local snapshots in my computer? I don't believe it. My mac has updated to High Sierra and my external hard drive fails to backup because Time Machine could not create a local snapshot.

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What type of filesystem is your root device? If I'm not mistaken it has to be the new APFS (i.e. not HFS+) in order to support local snapshots. Not all upgrades to High Sierra will convert the root filesystem to APFS.

However backups using Time Machine should still work.

What does tmutil status show?

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