If you're sure you don't need things, you can delete them, even before making a backup. But if you delete something of value, and you don't have a backup, you might be sorry.
So why not make 2 backups: one before, and one afterwards?
i have new aspire e-15 laptop and i want to know can i delete the extra junk like games and items like booking.com etc? i have not made a back up yet should i wait till then to delete the extra junk?