Mongodb saving data to memory

Hi guys! I have deployed a Mongodb instance on railway through railway's choice of boilerplate deployments. To this database I'm adding data with ttl of 5 mins hence you can see the data with a slope and cliff. My doubt is, is my data being saved to memory and not to disk?

Solution:

The provided mongodb template saves data to disk, and that's just simply what it's memory usage looks like

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