Incremental backup fails with error "ImportError: cannot import name 'sighandle'" after previous successful full backup about virtnbdbackup

[abbbi]

ive just installed the package on a fresh alma 8.8 instance and the required sighandle.py is included in the package. I wonder how it could ever work for you because signal handling code is loaded no matter if full or incremental backup is attempted. If this file is missing or broken the utility wont work at all.

[root@alma8-cli t]# rpm -ql virtnbdbackup | grep sighandle\.py
/usr/lib/python3.6/site-packages/libvirtnbdbackup/sighandle.py

the only way i could reproduce this is by breaking the installation by removing the sighandle code:

[root@alma8-cli t]# mv /usr/lib/python3.6/site-packages/libvirtnbdbackup/sighandle.py /usr/lib/python3.6/site-packages/libvirtnbdbackup/sighandle.py.voo
[root@alma8-cli t]# virtnbdbackup 
Traceback (most recent call last):
  File "/bin/virtnbdbackup", line 27, in <module>
    from libvirtnbdbackup import sighandle
ImportError: cannot import name 'sighandle'

Please check if the environment is still functional / all files from the rpm package exist and/or consider re-installing.