TimeChimp uses Microsoft Azure. This is a cloud environment from Microsoft. Microsoft has several data centres for this. We use the data centre in Amsterdam. This is where our application and all our data (yours, too) are stored. Microsoft itself takes care of security, and we make sure there are continuous backups and security tests.
In addition, we regularly do so-called "penetration tests", in which an external company tests the security of our product so that we always comply with the latest standards. As a result of this, our product is always 100% up-to-date and secure.