There is lot of ways to ask for questions and find answers about NSsbackup.
On Launchpad (recommended)
On the Launchpad website https://answers.launchpad.net/nssbackup/ , click on Ask a question , Select the EN language and ask your question .
On this website
Leave a comment on the article that made you think of this question.
By writing directely to a member of the team
On Launchpad or even on the author list of this website you will be able to find a communication medium with them.