Hi Khushboo. A great resource to find more about this is within this post. Have a look and let us know how it goes. Tableau Server Upgrade Steps from Pre-TSM (2018.1 or older) to TSM (2018.2 or newer)
I already went through these resources mentioned in the above link. By scripts I mean like handy script command related with the back up, restoring the back up, obliterate tableau server from tabadmin command line utility etc.