Scheduled Backup don′t work

Hi, the scheduled backup don′t work, the log-file stops at the filesystem scan process.

WP-Cron is active

See the start an the end of the log files:
[2020-01-03 21:55:37] xcloner_scheduler.INFO: New schedule hash is -e6566 [] []
[2020-01-03 21:55:37] xcloner_scheduler.INFO: Starting cron schedule ‘Backup’ [“CRON”] []
[2020-01-03 21:55:37] xcloner_file_system.INFO: Starting the filesystem scanner on root folder /mnt/web521/e3/64/54499064/htdocs [] []
[2020-01-03 21:55:37] xcloner_file_system.INFO: Adding .htaccess to the filesystem list [“FILESYSTEM SCAN”,”INCLUDE”] []
[2020-01-03 21:55:37] xcloner_file_system.INFO: Excluding .mc from the filesystem list, matching pattern .mc [“FILESYSTEM SCAN”,”EXCLUDE”] []

…..

[2020-01-03 21:57:35] xcloner_file_system.INFO: Adding wp-content/uploads/2015/10/Rotor-Fuenf-300×300.jpg to the filesystem list [“FILESYSTEM SCAN”,”INCLUDE”] []
[2020-01-03 21:57:35] xcloner_file_system.INFO: Adding wp-content/uploads/2015/10/Rotor-Fuenf-320×283.jpg to the filesystem list [“FILESYSTEM SCAN”,”INCLUDE”] []
[2020-01-03 21:57:35] xcloner_file_system.INFO: Adding wp-content/uploads/2015/10/Rotor-Fuenf-320×320.jpg to the filesystem list [“FILESYSTEM SCAN”,”INCLUDE”] []
[2020-01-03 21:57:35] xcloner_file_system.INFO: Adding wp-content/uploads/2015/10/Rotor-Fuenf-350×200.jpg to the filesystem list [“FILESYSTEM SCAN”,”INCLUDE”] []

Thanks
Carsten