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Backing up and Restoring Data in the Garmin eLog App
You can restore backed up data from a USB storage device in the Garmin eLog™ app. This can be useful if you need to reinstall the Garmin eLog app, or if you need to install the app on a different device.
NOTE: The Garmin eLog app will back up data for the last six months.
See Formatting a USB Flash Drive for Use with a Garmin eLog ELD for instructions to format before backing up.