Yesterday, I gave a talk for the KWLUG on Incremental Backup For Linux. This is targeted towards home networks or small businesses using Linux, although I touched a bit on some enterprise considerations and technologies.

The solution I use relies on the dump and restore utilities for the ext4 filesystem, along with rsync from laptops.

The slides are attached below, as PDF. The meeting was recorded, and the video should appear here shortly.

On Friday 27th of January, 2018, I gave a presentation at the KW RASC on Al-Sufi's Book Of Fixed Stars.

The book is the first illustrated pictorial star atlas, and was very influential for centuries after it was authored. It spread widely from central Asia, throughout the Middle East, and to Europe. It was translated into many languages.

Here is the presentation slides, and audio recording:

If you use a telescope for astronomical observation or astrophotography, or a camera for night scenes, such as the aurorae, star trails, and the like, you must have experienced dew building up within an hour or less.