Capture Card Summary data on a schedule

Hello.  I have a card that is continually counting how many "wigets" meet a certain criteria.  The number changes hourly.  

 

I'd like to capture that card's Summary number at various intervals (maybe hourly) during the day so I can report on trends. Any easy way to do this?  

 

Unfortunately the source data changes when it updates so the summary info is not stored for historic viewing at a later date.

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