The original Duplicati project was started in June 2008 and intended to produce a graphical user interface for the Duplicity program.

This included a port of the Duplicity code for use on Windows, but was dropped in September 2008,[5] where work on a clean re-implementation began.

The new user interface is web-based, which makes it possible to install Duplicati 2 on headless systems like servers or a NAS.

[6] The previous developer Kenneth Skovhede takes on the role of CTO as a full-time position.

[7] In May 2024, the first commercial product ‘Duplicati Portal’ was introduced, which is a centralised, cloud-based solution designed to monitor and manage backups across multiple devices and environments.

The Duplicity model, on which Duplicati is based, relies heavily on components in the system, such as librdiff, TcFTP, and others.

Most notably, Duplicati features an rdiff and AESCrypt implementation that work on any system that supports a Common Language Runtime.

Duplicati 2 regularly tests the backup to detect corrupted files early.