With hard drives you can never be quiet, when you least expect it or when you are in the midst of your work here comes the problem. It can happen at any time, so it is always advisable to make periodic backups of the hard disk to be able to restore Mac hard drive and all your customers in their time of need. There are many backup methods for the Mac, but I advise you to use Time Machine, an application integrated in the OS X system, if you want to know how to make a backup with Time Machine I suggest you read this guide.
If you are among those who are having problems with your hard disk or need to upgrade to a new Mac, it may be important to have the possibility to restore your Mac's hard disk with all its data and then recover all the work on the hard disk. If you backed up with Time Machine, here's how to recover the data.
How to restore Mac hard drive
1. Turn on your Mac and hold down the keys Command + R to enter the OS X Recovery partition.
2. The Mac should start up and appear a screen that says OS X Utilities.
3. SelectRestore the backup from Time Machine and click Keep it going.
4. Read the information on the page Restore the system and click Keep it going.
5. Select the Time Machine backup and click Keep it going.
6. Select the most recent backup of your hard drive and click Keep it going. The Mac will then restore Time Machine backup; once done the Mac will restart.
Well, having had the chance to restore Mac's hard drive with all its data was a great thing and a great help to your work. But there are conditions in which hard drive recovery is not so simple. If, for example, you have replaced your Mac's hard drive and are not included, the OS X operating system will not be able to boot from the OS X Recovery partition. But don't worry, because you can still restore your Mac's hard drive and recover the Time Machine backup disk (if you've backed up using Time Machine): just hold the button down Option when you start up your Mac; you will be able to select the Time Machine backup disk as a boot drive, and you will have all the backup data.
I hope this guide to restore Mac hard drive has been useful to recover your precious data that seemed to be lost from possible anomalies of the Mac.