I have the problem with cron backup daily.
I tested with 1 domain and 1 customers.
When cutomer dont have a user emails i have this error
zip warning: name not matched: *
zip error: Nothing to do! (try: zip -r /home/admispconfig/ispconfig/temp/fbf1cc47bf3aced882c058a159368c3e/web7_user.zip . -i *)
If customer create 1 user email backup create normal
Sorry my english is poor