Sense-HOW to backup and restore kexts before OSX86 Upgrade

In hackintosh,Backing up your kexts is very necessary when you want to upgrade your os version to the latest or some other since we can restore it in case of any problems.kexts are kernal extensions,these are the driver files that are placed in the /system/library/extensions/.kext files.these are the files that allow for the extra hardware support and in osx86 to replace apples default driver with that are very easy and optimised for use in pc’s.
In leopard .kext files are installed in /system/library/extensions folder and during booting the required .kext files are supplied from this.take a full backup of your kexts because some kexts may disappear after the update procedure

For backup of kexts:

first open the terminal and follow type the below commands

sudo -s
[enter password]
cp -r /System/Library/Extensions /System/Library/Extensions.backup
cp -r /mach_kernel /mach_kernel.backup

For restoring kexts:

open terminal and type these commands

sudo -s
[enter password]
cp -r /System/Library/Extensions.backup /System/Library/Extensions
cp -r /mach_kernel.backup /mach_kernel

This is the method how to create backup and restore your kexts.