Swizerlan On a sidenote I would like to learn how to use a direct ethernet cable as a backup solution.
Same as if you had used WiFi. I.e., Just connect the Mac to the ASIAIR's Samba server as before, but this time using the Ethernet IP address. As usual easiest to use the Go menu of the Finder (in Finder's main menu bar) and there is a Connect To Server... item.
You can only use Samba for image (and log) data. You cannot archive the SD card, for example.
If you have third or fourth generations ASIAIR, you can also use the USB C connector -- that port implements a USB-2 protocol. Connect that port to a USB port of the computer, and the ASIAIR should simply mount as a disk volume (i.e., looks like a USB memory stick). Be sure to dismount the volume after use, just like you need to dismount a USB stick. If the computer only implements Thunderbolt on its USB-C port (like a MacBook pro), you would need a Thunderbolt to USB 2/3 adapter.
Basically, Raspbian, etc implements a Samba server, which the ASIAIR uses. The server can be accessed through WiFi, Ethernet or USB. Your choice.
I pretty much never plug or unplug storage from my various ASIAIR, and instead go through Samba. For an old first generation ASIAIR (which I use naked in an All Sky camera), I go through WiFi. With the second, third and fourth generation ASIAIR, I use direct Ethernet exclusively. (I just last week had to re-burn the firmware of the All Sky camera, though -- a power outage from a storm took out the SD card.)
Chen