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Hi Tim, Yes, you've got it exactly. The regex="true" flag is necessary because you are specifying a range of keyValues (HWRF*). If you only want two model runs then yes your specification is correct, but you could include the <modTimeToWait> flag if you want. What this does, is say you get two model runs (for some reason) really close to one another: Model_run_1 : 00:00z Model_run_2 : 06:00z Model_run_3 : 06:02z The modTimeToWait flag will increase the versionsToKeep by 1 if data matching this rule has been stored within modTimeToWait (optional, should only be specified with versionsToKeep). So in the above scenario, if modTimeToWait was 15 minutes: <modTimeToWait>00-00:15:00</modTimeToWait> Then it would keep all 3 of those models around until the next model runs come in, and then I believe it would purge the oldest two. So your entry would look like: <rule regex="true"> <keyValue>HWRF*</keyValue> <versionsToKeep>2</versionsToKeep> <modTimeToWait>00-00:15:00</modTimeToWait> <-----this line is optional! </rule> Does that answer all your questions? --Shay Carter AWIPS Software Engineer UCAR - Unidata If you're interested, please feel free to fill out a survey about the support you receive: https://docs.google.com/forms/d/e/1FAIpQLSeDIkdk8qUMgq8ZdM4jhP-ubJPUOr-mJMQgxInwoAWoV5QcOw/viewform Ticket Details =================== Ticket ID: YFI-843426 Department: Support AWIPS Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.