Synchronization consists of adding new records, updating existing and removing records. Synchronizing is possible only if the original source contains a unique key or value to reference each location and that key is imported to Nearest!
If a record is not existing in Nearest! (based on the unique key) the location is added.
Existing locations and its elements will be updated.
If a location is missing in the original source (from which it was originally imported from) it will be disabled in your dataset.