After installation of all Dropbox related items that run on my “desktop”-computer onto my laptop the latter doesn’t show the Dropbox folder in Nemo nor the Dropbox icon in the systray.
I even re-installed the already installed gnome-shell-extensions-appindicator to no avail.
Any idea how to fix that or where I should search (in the system or in the web) for further related information?
… and what are those items?
Nemo indicates that you use Cinnamon.
Perhaps you need to first start a service, or log in to a specific dropbox account?
I remember there to be a limitation - only one dropbox account …
or the configuration needs to be changed.
But that was a few years ago - I only use it sporadically and only via the web interface.
dropbox [AUR], nemo-dropbox (←not in any other repo), and sort of indirectly above mentioned extension
Could it be that I have overlooked another needed package?
And no, no Cinamon, just Gnome. (But Gnome killed the usability of Nautilus long ago, thus initiating the fork to Nemo.)
No, that is o.k.
What about:
The dropbox AUR package installs a systemd service (look at the PKGBUILD):
https://aur.archlinux.org/packages/dropbox
https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=dropbox
You likely need to enable and start it …
looks promising …
and leads to a not directly related question I’m carrying with me for some time:
If there’s a package xyz and another one xyz-git, is it always advisable to install the git-version? Are there common differences?
No.
That doesn’t mean that one is better or inferior, though.
Just differences, the pros and cons of which you need to decide on case by case.
not sure - git is likely the most recent version
but it may not be
I note that the AUR version of Dropbox seems to have a few issues in recent times; whether they are related, I can’t say.
However, the Flatpak version seems to work as expected (no launchers missing); perhaps that’s an option instead.
flatpak install dropbox
Regards.
I don’t use any flatpacks and would avoid that as long as possible, preferably for ever.
And the AUR version runs just fine on the other machine …
But I found libappindicator-… on the desktop system installed and not on the laptop!
Since this is also mentioned in the Dropbox (AUR)-links in your post and in that of @Nachlese, I’d like to mark those 2 posts as solution … 
I share your sentiments regarding flatpak (along with most containerised application formats), yet, it nonetheless remains an option.
I tried it myself only minutes ago. The launcher icon was placed under “Internet” and, once launched, the icon appeared in the tray.
Dropbox via the AUR completed the build successfully, and installed. The launcher was also placed under “Internet”; however, no icon appeared in the tray.
Takeaway whatever you will from that. 
Regards.
You can only mark one.
Flip a coin and mark one.
I don’t care at all whom you decide on.
Absolutely
if you install the -git version you may either get a bug-fix, a new feature etc.
If you use the regular version it usually will build from a release tag
libappindicator-gtk3 is listed as an optional dependency (on the AUR page), so it would seem the issue was that you neglected to install it on the second machine.
A simple oversight. All being well, an easy fix.
sudo pacman -S libappindicator-gtk3
Cheers.
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