
If you are using MacOS, you can use Time Machine to backup your data into external drive. Time Machine will do the backup automatically when the backup drive is connected to your Mac machine.
However, if this is your first time doing Time Machine backup, it will take long time to prepare before can proceed the backup. And the initial backup should be completed less than 5-6 hours depending on how big the data you have.
Unfortunately, my case is different. My initial backup was stuck and not moving even though the machine was left the whole night. The backup stuck when it reached about 12GB.
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