One of the best feature of Apple’s OS X which people actually love about that is OS X Recovery,This Extraordinary feature are release after Snow Leopard (10.6.x),OS X Lion (10.7.x) and later include OS X Recovery. This feature includes all of the tools you need to reinstall OS X, repair your disk, and even restore from a Time Machine backup without any Flash disk (Installer Media)
OS X Recovery System
Well if you use this feature offline then you have to set Time Machine Backup,OS X Recovery includes a built in set of utilities as part of the Recovery System. You can use OS X Recovery to do the following:
- Restore your Mac from a Time Machine backup.
- Verify and repair connected drives using Disk Utility.
- Check your Internet connection or get help online using Safari.
- Install or reinstall OS X.
To start your computer from Recovery, restart your Mac and hold down the Command and R keys at startup.