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skourtip if the old data gets removed in the PQ there is no way you can keep it. You have to change the logic in PQ so as not to filter the data.
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Hi skourtip ,
Power BI is a "read only" system so it doesn't have the ability to store data from three months ago after a refresh.
I have found some similar documents. Please refer to the following links to see if it helps you.
refer
https://www.thebiccountant.com/2017/01/11/incremental-load-in-powerbi-using-dax-union/
You will either have to modify the source system , or put in an intermediate process in place to store a previous day snapshot of data, then have Power BI read in the source data and the snapshot, then do the comparison.
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Community Support Team _ Polly
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