use omnibus package to refer to omnibus gitlab at all times to avoid confusion

doc/raketasks/backup_restore.md

@@ -10,10 +10,10 @@ The filename will be `[TIMESTAMP]_gitlab_backup.tar`. This timestamp can be used
 You can only restore a backup to exactly the same version of GitLab that you created it on, for example 7.2.1.
 
 ```
-# omnibus-gitlab
+# use this command if you've installed GitLab with the omnibus package
 sudo gitlab-rake gitlab:backup:create
 
-# installation from source or cookbook
+# if you've installed GitLab from source or using the cookbook
 bundle exec rake gitlab:backup:create RAILS_ENV=production
 ```
 
@@ -49,7 +49,7 @@ Deleting old backups... [SKIPPING]
 ## Storing configuration files
 
 Please be informed that a backup does not store your configuration files.
-If you use Omnibus-GitLab please see the [instructions in the readme to backup your configuration](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#backup-and-restore-omnibus-gitlab-configuration).
+If you use an Omnibus package please see the [instructions in the readme to backup your configuration](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#backup-and-restore-omnibus-gitlab-configuration).
 If you have a cookbook installation there should be a copy of your configuration in Chef.
 If you have a manual installation please consider backing up your gitlab.yml file and any SSL keys and certificates.
 
@@ -58,7 +58,7 @@ If you have a manual installation please consider backing up your gitlab.yml fil
 You can only restore a backup to exactly the same version of GitLab that you created it on, for example 7.2.1.
 
 ```
-# omnibus-gitlab
+# omnibus package installation
 sudo gitlab-rake gitlab:backup:restore
 
 # installation from source or cookbook
@@ -104,8 +104,9 @@ Deleting tmp directories...[DONE]
 
 ## Configure cron to make daily backups
 
-For omnibus-gitlab, see https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#scheduling-a-backup .
+For omnibus package installations, see https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md#scheduling-a-backup .
 
+For installation from source or cookbook:
 ```
 cd /home/git/gitlab
 sudo -u git -H editor config/gitlab.yml # Enable keep_time in the backup section to automatically delete old backups