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Maintain historical Data
Hello all, I have a transaction system that contains percentage completion and status of Projects. The thing is, when the percentage completion of a project is updated, the previous value is lost an...
You cannot. Power BI is a "read only" system so it doesn't have the ability to store data beyond a refresh.
You will either have to modify the source system (you said not an option), 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.
Incremental refresh might be an option if you want to have the hisorical data not changed but only change the specific number of days data in PBI.
Check out some incremental refresh videos on youtube, might be helpful.
Thanks,
pthapa