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#11
I use File History and often leave my backup drive disconnected for days on end (normally until it bugs me to plug it in again). When I connect it it then writes all the changes to the backup drive. I imagine (based on the link above) that it does the same if it is connected - keeps the changes in it's cache and only writes to disk when it determines you aren't using the PC too much.
Are you concerned about it not writing to the backup disk every hour or are you missing changed documents? If the latter then most likely so am I...
I've changed File History to save every 10 minutes. I'll make a document and will change and save it every 10 minutes to see if that is really true though. We will see in an hour or so...