To make the crust, combine the crust ingredients and pat into the bottom of a greased 7-inch springform pan. (This is a smaller pan than average.) Freeze for 20 minutes while you mix together the cheesecake ingredients.
For the cheesecake, mix together cream cheese, sugars, sour cream and flour. Add vanilla and salt. Add the eggs one at a time. Blend well but don't overmix. Pour half of the mixture into the crust.
Dollop half of the strawberry preserves over the cheesecake mixture.
Pour in the rest of the cheesecake mixture. Dollop the remaining strawberry preserves on top and swirl with a knife to make a pretty pattern.
Place 1½ cups water in the bottom of your instant pot. Insert your instant pot trivet/rack. Place the springform pan on top of the trivet. Cook on manual for 35 minutes. Release pressure naturally for 10 minutes. (Set a timer so you don't forget!) Remove the cheesecake from the instant pot. Cool for 10 minutes. Run a knife around the edges to loosen the cake. Cool 1 more hour, and then chill for at least 4 hours. Remove sides of springform pan before serving.
Serve with whipped cream and additional strawberries, if desired.