issue when backup gitlab

The step to backup gitlab on https://gitlab.com/gitlab-org/omnibus-gitlab/tree/master is:

sudo gitlab-ctl stop unicorn

sudo gitlab-ctl stop sidekiq

sudo -u gitlab-psql /opt/gitlab/embedded/bin/dropdb gitlabhq_production

sudo gitlab-rake gitlab:backup:restore BACKUP=1393513186

sudo gitlab-ctl start

but,I can not backup the gitlab after droped the database gitlabhq_production.

The error is that the database gitlabhq_production is not exist.

so when backup the gitlab,the database gitlabhq_production must not be droped.

I hope the Administrator can modify the document on https://gitlab.com/gitlab-org/omnibus-gitlab/tree/master