Salesforce API provides two methods for data replication, each of them allows you to retrieve a list of objects that:

Have been updated or deleted during specified timespan for the specified object.

Have been replicated successfully starting from January 1, 1970, 00:00:00 GMT

Have been added or deleted during specified timespan for the specified object.

Have been created or deleted during specified timespan for the specified object.

Answer:
Have been updated or deleted during specified timespan for the specified object.

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