Backup failure post samba update

Please post the output of

[root@neth ~]# alternatives --list | grep -E '(cifs|libwb)'
cifs-idmap-plugin	manual	/usr/lib64/cifs-utils/idmapwb.so
libwbclient.so.0.14-64	manual	/usr/lib64/samba/wbclient/libwbclient.so.0.14

To workaround the issue try:

signal-event nethserver-samba-update

Run again

 alternatives --list | grep -E '(cifs|libwb)

…and compare with previous output

See also