1) each installation profile is assigned a unique user ID that is stored on your computer

2) every 24 hours it sends IP, ID, version, cpu architecture, screen resolution and time since last message

3) then we store the resolved approximate location after using a local geoip lookup

So, what they have for each ID: approximate location, CPU architecture, screen resolution. They can easily know places you visited.

From Quant's privacy policy: "French law makes it mandatory to keep some connection data (e.g. user ID used, URL or position, nature of the operation, time…) for one year."