How to back up your Mac

A concise guide to using macOS Time Machine: choose an external storage device at least twice the size of your Mac’s internal drive, connect it, designate it as the backup disk in System Settings > General > Time Machine, decide whether to erase existing drive contents or retain prior backups, and start “Back Up Now.” The guide emphasizes using the external drive exclusively for backups, notes the first backup can be lengthy but runs in the background, and explains that future backups can run automatically whenever the drive is connected.