I haven't always used Garmin, so sleep- and activity data that I already had is stored in a unified way, and I add the data from the Fenix 3 from the files in \Garmin\Monitor.
But sometimes I forget to copy those files before enabling Bluetooth in the morning, and as soon as GCM syncs, it seems that they are gone. I can't fully exclude user error (it seems weird to me that sync would remove Monitor files but not Activity files).
No matter the cause of losing the files, I wonder, am I overlooking something? There must be a way to export sleep- and activitytracking data from Connect, I just can't find it.