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2. Time Machine (macOS) - Wikipedia

   en.wikipedia.org/wiki/Time_Machine_(macOS)

   Time Machine is the backup mechanism of macOS, the desktop operating system developed by Apple.The software is designed to work with both local storage devices and network-attached disks, and is commonly used with external disk drives connected using either USB or Thunderbolt.

3. Disk Utility - Wikipedia

   en.wikipedia.org/wiki/Disk_Utility

   The functions currently supported by Disk Utility include: [1] Creation, conversion, backup, compression, and encryption of logical volume images from a wide range of formats read by Disk Utility to .dmg or, for CD/DVD images, .cdr; Mounting, unmounting and ejecting disk volumes (including both hard disks, removable media, and disk volume images)

4. What does "free up disk space" mean — and how do you fix it?

   www.aol.com/lifestyle/does-free-disk-space-mean...

   Use the Disk Cleanup function on Windows. Windows has a built-in feature that helps you free up disk space; it’s called Disk Cleanup. Just click the Start button and then search for it by name.

5. File system fragmentation - Wikipedia

   en.wikipedia.org/wiki/File_system_fragmentation

   The remainder of the disk space is one free block. Thus, additional files can be created and saved after the file E. If the file B is deleted, a second region of ten blocks of free space is created, and the disk becomes fragmented. The empty space is simply left there, marked as and available for later use, then used again as needed.

6. Hard disk drive failure - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive_failure

   A hard disk drive failure occurs when a hard disk drive malfunctions and the stored information cannot be accessed with a properly configured computer. A hard disk failure may occur in the course of normal operation, or due to an external factor such as exposure to fire or water or high magnetic fields , or suffering a sharp impact or ...

7. Continuous data protection - Wikipedia

   en.wikipedia.org/wiki/Continuous_data_protection

   In some situations, continuous data protection requires less space on backup media (usually disk) than traditional backup. Most continuous data protection solutions save byte or block-level differences rather than file-level differences. This means that if one byte of a 100 GB file is modified, only the changed byte or block is backed up.

8. FileVault - Wikipedia

   en.wikipedia.org/wiki/FileVault

   FileVault was introduced with Mac OS X 10.3 Panther, [1] and could only be applied to a user's home directory, not the startup volume. The operating system uses an encrypted sparse disk image (a large single file) to present a volume for the home directory.

9. Target Disk Mode - Wikipedia

   en.wikipedia.org/wiki/Target_Disk_Mode

   The 12-inch Retina MacBook (early 2015) has only one expansion port, a USB-C port that supports charging, external displays, and Target Disk Mode. Using Target Disk Mode on this MacBook requires a cable that supports USB 3.0 or USB 3.1, with either a USB-A or USB-C connector on one end and a USB-C connector on the other end for the MacBook. [5]