How can I recover my Recovery hd

How can I recover my recovery HD on my mac pro

Better forums would be Lion Community, and MacBook Pro (this is not notebook users).
https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion?view=discussi ons
Depends what year and whether yours came with Lion (2011 and later) or not.
Whether you know how to reinstall Liion. But what happens when you hold Option key or Command-r when you startup? you can't boot into Lion Recovery? And do you have TimeMachine?  an external backup drive?
Lion Recovry & TimeMachine
http://www.apple.com/support/lion/installrecovery/
http://www.apple.com/support/lion/
http://support.apple.com/kb/HT1427
General Time Machine Stuff:
Time Machine vs. Clones and Archives    
How Time Machine Works its Magic
Time Machine’s Gory Details:
https://www.apple.com/support/timemachine/
How To Restore Your System
http://pondini.org/TM/14.htmlMac OS X v10.7 Lion
Frequently Asked Questions
Troubleshooting
Using Time Machine with a Time Capsule
Using Time Machine with an Airport Extreme Airdisk
General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
Identifying resource hogs and other tips: Using Activity Monitor to read System Memory and determine how much RAM is being used
Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?
To identify potential hardware problems: Apple Hardware Test
General Mac maintenance: Tips to keep your Mac in top form
Using Cloning as a Backup Strategy
Carbon Copy Cloner 3.4.1
OS X Lion Install to Different Drive

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