Mac OS offers _____________ for data backup.

A. File history
B. Time Machine
C. File backup
D. None of above

Explanation:

Mac macOS (10.5 and above) has an excellent built-in backup tool called Time Machine. Once you plug in a hard drive and set up Time Machine, it will work automatically in the background, continuously saving copies of all your files, applications, and system files (i.e., most everything except for the stuff you likely don’t need to back up, such as files in the trash bin, cache files, and log files). If you run out of disk space, Time Machine will automatically erase the oldest version of the files to make way for the new ones.