Note : gitlab should be same version.
Manual backup:
/etc/gitlab/gitlab-secrets.json
/etc/gitlab/gitlab.rb
Generate backup:
gitlab-rake gitlab:backup:create
Restore backup:
You have run sudo gitlab-ctl reconfigure at least once.
GitLab is running. If not, start it using sudo gitlab-ctl start.
gitlab-ctl stop unicorn
gitlab-ctl stop sidekiq
gitlab-rake gitlab:backup:restore BACKUP=335565885_2019_05_20.6
restore /etc/gitlab/gitlab-secrets.json and /etc/gitlab/gitlab.rb