Dear Tkakura,
thank you for your comment. I got your point, but I am afraid my experience contradicts your explanation. I made a quick test just now with my QHY533, yielding FITS of roughly 18 MB. I made a sequence of 10 images with the exposure time of 1 s and the results are as following:
Save locally (laptop) with Fits Viewer on: 75 s
Save locally (laptop) without Fits Viewer: 65 s
Save remotely (RPi) to SD card: 22 s
Save remotely (RPi) to USB drive: 28 s

So I am sorry, but it works differently than what you say, at least in my case. I used the new KStars 3.6.3 Beta, but I am sure the behaviour was similar even with my 2.9.x KStars version.

Clear skies,
Michal

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