I tried using the backup script provides herehttps://github.com/gitbucket/gitbucket/wiki/Backup
but the curl statement for starting the database export doesn't work. If i call the site myself in a browser like firefox it works like a charm. So I tried curl -v and saw that it responds an 401 Unauthorized code.

So I tried with authorization like the following:
curl -u :http://localhost:8080/database/backup
but this also doesn't work.

I am using the acutal versions of gitbucket 4.33 and the plugin 1.8

Please provide some help on this issue.