Oops, I got confused. I have Vue console with WiFiLoger at 5 mnute interval and my Envoy with USB Logger at 10 mintes and it is this USB logger that has 17 days before rollover. I know because I manually start Weatjerlink PC twice a month to catch up the daya, and I have missed doing that a couple of times and then checking the WL PC logged data shows anything older than 17 days is not logged.
@Mattk, yes WiFiLogger does upload to WL.com but with setting as type Weatherlink PC.
Enjoy,
Paul