To protect and prevent your data on your Mac, it is always better to maintain a backup of your hard drive. Like there are situations in which serious drive problems appears like Catastrophic Drive Failure appears. In this situation, you need to buy an external hard drive to use it with Time Machine. In a condition when your internal drive fails, you will then need another external hard drive to restore to from Time Machine.
If the external hard drive has limited space then once the space get full, it will automatically start deleting older backups to make space for new backups so its always good to buy a large size hard drive to keep long time history.
Once you have setup Time Machine, the type of interface to choose for the new external hard drive you intend to use as a temporary startup disk is up to you.
Steps to Perform Mac hard drive recovery from a failed internal hard drive:
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Connect external hard drive to the computer and turn it on
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Install your Mac OSX Install media in the CD/DVD drive
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Hold Down the C key when you press the power button. The computer will boot from the install media in the CD Drive.
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Choose the language and click continue
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In the installer, Choose utilities > Restore System from Backup
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Select the Time Machine disk and click continue
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Select the latest backup from the Time Machine Disk
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Follow on screen instructions to select the new external hard drive to restore to
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It takes time according to size of the hard drive
If it fails then it is better to use professional Mac hard drive recovery program. It is built to scan and recover the mac Hard drive data which is inaccessible, deleted, corrupted and lost from your Mac computer. It is simple, easy to use, very powerful in recovering data. Download Mac Hard Drive Recovery and get your lost data back.