Lotus domino backup - no data are transffered

Hello,

backup of lotus domino was working and suddenly one day we have issue, that no data are transffered for lotus full and incremental and transaction logs backup

filesystem backup is working for D:\Lotus\Domino\data and for T:\Logs  (filesytem backup is working for other directories and drives as well)

master redhat 7.5.0.7

client win2k8 7.5.0.7

have somebody any ideas?