Increment a sensor by a calculated value every X seconds

Configuration
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Hi,

a brief question by a home assistant newcomer.
I would like to create a sensor and regularly (say every 60s) update its value by incrementing it by some number which is to be calculated from some other sensor value.
And I would like this incremented sensor to keep/restore its value after a HA restart.

Thank you very much in advance!

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Thanks a lot, with your hint and some trial and error I ended up with:

  - trigger:
      - platform: time_pattern
        minutes: "/1"
    sensor:
      - name: "Energieintegral Summation"
        unique_id: energieintegral_summation
        state: >
          {{  ( states('sensor.energieintegral_summation') | float + states('sensor.vl_uberschuss') | float) | round(1, default = 0) }}
        unit_of_measurement: "Kmin"

What has unneccessarily has cost me some lifetime is that I unique_id seems to be obligatory here, otherwise the template throws errors to the log.

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