Empty directories?

Hello,
I use the version 1.13.0 AppImage on Ubuntu.
I just note that I have full of empty dorectories on the “d” directory generated by Cryptomator. Here an example of encrypted files ( a few files of few ko):


Should I remove the empty ones, or keep them?
I do synchronizations to backups my vaults, so I wonder if I should backup them too, or only those contains files.
Thank you

You can remove all empty two-letter directories. See also

Nice, I will. thank you!