How to take backup of single User Lync Contact list In Lync 2010 and then restore the contact

How to take backup of User Lync Contact list In Lync 2010 and then restore the contact

PS C:\Program Files\Common Files\Microsoft Lync Server 2010\Support> .\DBImpExp.
exe /user:abhishek.gupta@bsci.com /sqlserver:"lchlncdbl01.labbsci.labbossci.com\
lab" /hrxmlfile:"C:\absabhi.zip"
SQL Schema Version: 59
User Data Schema Version : 21
Error: The specified user was not found in the database.
PS C:\Program Files\Common Files\Microsoft Lync Server 2010\Support> .\DBImpExp.
exe /user:abhishek.gupta@labbsci.com /sqlserver:"lchlncdbl01.labbsci.labbossci.c
om\lab" /hrxmlfile:"C:\absabhi.zip"
SQL Schema Version: 59
User Data Schema Version : 21
Exporting 1 Homed Resource(s) from database...
100% complete.
Export completed successfully.
PS C:\Program Files\Common Files\Microsoft Lync Server 2010\Support> .\DBImpExp.
exe /import /user:abhishek.gupta@labbsci.com /sqlserver:"lchlncdbl01.labbsci.lab
bossci.com\lab" /hrxmlfile:"C:\absabhi.zip"  /restype:user
SQL Schema Version: 59
User Data Schema Version : 21
Importing Homed Resources into database...
1 Resource(s) imported.
Import completed successfully.

PS C:\Program Files\Common Files\Microsoft Lync Server 2010\Support>