Ok, I have the general picture. One more question; Does WL append info to the current month's .wlk file or resave the entire file? Also, once a month is complete, does WL make any changes to the "OLD" .wlk files?
From what I can tell, WL appends to the current file and even though the date changes of files from previous months WL does not make changes to those files.
Finally, since my site only uses current calendar year info. Can I remove "prior year" .wlk files from my hard drive - once they are backed up?
You can remove as many of the older WLK files as you wish, however it will restrict you from looking back at historical info.
Since I have a dedicated PC for the weather applications I also have a stripped down version of Weatherlink installed on my other PC that I use for accessing all the WL data and graphs.