Gitlab Version:8.9.2 migration

[Pravesh Mathema]

I want to migrate my gitlab Version:8.9.2 from server A to server B. can any one provide me the steps o backup and restore.

GitLab information

Version:        8.9.2

Revision:       bf922fb

Directory:      /opt/gitlab/embedded/service/gitlab-rails

GitLab Shell

Version:        3.0.0

Repositories:   /var/opt/gitlab/git-data/repositories

Hooks:          /opt/gitlab/embedded/service/gitlab-shell/hooks/

Git:            /opt/gitlab/embedded/bin/git