I ran into this recently, backing up munin data to s3. I ran it at a time point offset from an hour to avoid those 'on-the-hour' rushes, but I was getting problems with the copy. Took me a moment to realise I was doing it on a 5-minute boundary, and munin fires on a 5-minute boundary - the data was being updated as I was copying it...

mental note: think harder, next time.