Hello Ravi, and welcome to Seven Forums.
It would be a good idea to create a set of Sony Vaio factory recovery discs to have as a backup to be able to do a factory recovery of Windows 7 if needed say if you are unable to do so normally from the factory recovery partition on the laptop.
A system repair disc
is not required, but could come in handy as well to be use to try and repair Windows 7 with if you were ever unable to boot into the System Recovery Options
screen using F8 at boot.
Hope this helps,