Georgy,
thanks for those scripts and for all your work with the X6100 firmware!
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When I thought about having a way to backup (and restore) Linux configuration settings, like NetworkManager connection settings and ssh keys, I decided to use zip files in the data partition instead of an overlay ext4 partition because I think the majority of the X6100 users runs and is very familiar with Windows based on the posts in this group.
I thought that using the existing data partition (which is VFAT) and a very common file archiving format like zip files would make their life easier because it would allow anyone (running Windows, Mac, or Linux) to say copy those backup files from one SD card to disk or to another SD card, or to see what's inside, or even to modify the zip file contents if someone so wishes (personally I am all for letting the user try new things).
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With the overlay partition it is definitely possible to do the same, but I am afraid it is not as simple as using zip files.
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Franco K4VZ