Backing up macOS is never a bad idea，Because your machine may be damaged、Failure or more serious problem occurs。no matter what happens，Backups can help you get back to work。 如何使用 Time Machine 和 iCloud 备份 Mac 使用 iCloud 备份 首先，Make sure your Mac backs up files to iCloud。Check steps are as follows： 1.Click the Apple logo in the upper left corner of the menu bar。 2.Select "System Preferences"。 3.Select "Apple ID"。 4.Make sure "iCloud Drive" is selected。 5.Select "Select..." on the right side of iCloud Drive..