I have roughly 2 GB free on my 128 GB SSD. WD Sync is taking up about 10 GB.
The main culprit appears to be Analytics.db3
How can I redirect WD Sync to use a different location? I have a 3 TB internal second drive and a couple of USB drives.
At the time of this post an option to select the location of the app's temporary folder is not available. However, you can request for the feature to be implemented by posting in the Ideas section of the WD Community.