allow backfilling lost data

As many are likely aware, there was a major Internet outage this morning due to a fault within the Level3/CenturyLink backbone.  We lost a lot of data as a result, most obviously from Meraki API fetches that failed during the outage.  In some cases, such as this one, the data could be backfilled after the outage, but the LM architecture is designed for near-realtime polling and does not currently support this.  My request is thus, if the data involved CAN be fetched after the fact, I would like some option to enable backfilling to cover the lost data at that time.