Originally Posted by sstorkel

You may need to upload, but not often...

I find that a day's worth of riding typically generates around 1MB of data. My Garmin Edge 705 has about 460MB of storage when it's empty. That should, in theory, be enough room to ride for 365 days straight without an upload. The trick is to set the "Data Recording" mode to "Smart Recording" rather than "Every Second". Smart Recording gives you all the detail you need if you're not working with a power meter and it dramatically decreases the size of the files. Turning the device off at the end of each day and starting a new ride the following morning also helps.