Hello Laurens, As mentioned here <https://cloud.google.com/functions/docs/concepts/exec#execution_guarantees>, background functions are invoked at least once. The way Functions is set up internally is a "at least once" delivery system meaning you should expect duplicate invocations. Multiple attempts could be made to execute the function. So to answer your concern, it would be something you have to guard against in your implementation. Here are some tips on making functions idempotent. <https://cloud.google.com/functions/docs/bestpractices/retries#make_retryable_background_functions_idempotent>
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