Question: If there is data in BI Blend tables, how do I track if there are changes in the BI Blend data from period to period in my workflows?

Answer

Use the workflow type of “BI Blend, Workspace”. This way you can import/transform the data and then immediately afterwards use a dashboard to query review the data on each cycle.
If the workflow tracking frequency is monthly then the a new BI Blend table is created for each month. If the workflow tracking frequency is yearly, then the BI Blend table is created for the year, with periods in a column.

Source: Office Hours 2019-12-12 Partner Enablement