I've a problem since the beginning of april this year.
From 2018 to april 2019 it works fine..
I backup a file from a server drive to an other connected drive.. cobian runs on my client pc.
The error message:
2019-07-03 10:02 The log tab has been cleared. The log file with its full content is still available from the Log menu
2019-07-03 10:02 Preventing the system from entering sleep mode...
2019-07-03 10:02 ** Backing up the task "Neue Aufgabe" **
2019-07-03 10:02 Counting the files for the task "Neue Aufgabe"...
ERR 2019-07-03 10:02 The source file "\\app-server\Werbung\Hostnet_Server\Server-Daten\hostnet-Daten-.xlsx" was not found
2019-07-03 10:02 The history file for "Neue Aufgabe" will not be saved because the result of the backup is empty
2019-07-03 10:02 Total backup time for "Neue Aufgabe": 0 hours, 0 minutes, 0 seconds
2019-07-03 10:02 ** Backup done for the task "Neue Aufgabe". Errors: 1. Processed files: 0. Backed up files: 0. Total size: 0 bytes **
2019-07-03 10:02 --
2019-07-03 10:02 The system can now enter sleep mode
2019-07-03 10:02 Total backup time: 0 hours, 0 minutes, 3 seconds
2019-07-03 10:02 *** Backup done. Errors: 1. Processed files: 0. Backed up files: 0. Total size: 0 bytes ***
2019-07-03 10:02 --
The file is ok, I work every day with it...
Where is the problem?

Thanks and greetings