Let's get back to statistical or calculated archives. Experience has shown that the same calculation is often used for different data (e.g. the hourly consumption is calculated for each of several dozen machines). In this case, it is quite tedious to configure the same thing many times, just with different source objects. Not to mention how to prevent errors or typos, or reconfigure all such archives in the event of a change.
This is a companion discussion topic for the original entry at https://d2000.ipesoft.com/blog/archiving-in-scada-and-mes-systems-part-2/