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I would recommend taking a look at the AFDataPipe to signup for snapshot updates. You could also use the AFDataCache, will will also signup for updates and you can set it to cache the values for the last 24 hours. There are a lot of posts on AFDataPipe on PISquare so you want want search a little. Note, when you signup for snapshots you are values that have not gone through the PI Data Archive compression yet so you will have higher fidelity data than what is in the PI Data Archive.