Following these instructions, you can make sure that on the next sync, all data is transferred, not just the changes:
- From Things on your Mac, go to Things > Preferences... > Devices.
- Select the device you wish to reset, then click "Remove Device" to remove the pairing with your iPhone, iPod touch, or iPad.
- Now you can set up syncing again. Things needs to be running on your iPhone, iPod touch, or iPad). Click "Add Device...", then follow the on-screen instructions.
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