What is Time Machine on Mac and how to use it

Time Machine is the built-in backup feature on Mac that automatically saves copies of all your files to an external drive. Once you plug in an external hard drive and tell Time Machine to use it, your Mac backs up every hour and keeps hourly backups for 24 hours, daily backups for a month, and weekly backups after that. If you ever lose a file or your Mac stops working, you can get any version of any file back.

Time Machine is like having a time-traveling copy of your entire Mac. It watches your files and automatically saves new versions to an external hard drive throughout the day. When you accidentally delete something or your computer has a problem, you can go back in time and grab any version of any file from any day. It's the easiest, most automatic way to back up a Mac.