Version 2.35-1 of virtnbdbackup is marked for autoremoval from testing on Sun 26 Oct 2025. It depends (transitively) on aspcud, gringo, libldm, affected by #1097224, #1112751, #1112978. You should try to prevent the removal by fixing these RC bugs.
vcswatch reports that
this package seems to have a new changelog entry (version
2.36-1, distribution
unstable) and new commits
in its VCS. You should consider whether it's time to make
an upload.