Gilbert Quevauvilliers has an easy method of constraining data sizes in Power Query:
How cool would it be to not have to manually update your dataset to keep data for last 2 Years (last year and this year to the current date)?
In this blog post I will show you how you can easily filter dates in Power Query to show dates for last year and year to date by using the GUI and not having to hardcode anything.
I must admit the first time I saw this was when I watching my good friend Reid Havens presenting. Thanks Reid!
Read on for the technique.