MongoDB - Update Snap

I am designing a pipeline to update the accounts stored in a MongoDB collection.

The senario is: I have used Mongo - Insert to put salesforce data into one Mongo Database collection. However, this salesforce data is changing on a daily basis. I will have to check if there is any updates on the accounts(I already put into the collection) and insert only the updated attributes. Also, there may be new accounts created that I could not insert on my very first Mongo - Insert.

Is anyone know how to use Mongo - Update to achieve this business requirement? Much appreciated!