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I can't quite remember the folder structure but I think there should be a Garmin folder and maybe a Tracks folder under that. I grab everything in there.
I'll normally look at the files in Basecamp to strip out any shit before uploading.
It can be a bit annoying because it creates a new track every time it's turned on or something so you end up with files that are just GPS points around your house.
Yes, though not often. I use cable connection and copy files to my PC.
This wasn't a big deal for me since I only started using wifi on the Garmins last year and since you still need to plug them in to charge...
Can also use an SD card with etrex and a card reader which is faster.