Merge branch 'cron-up' into 'master'

Cron Up

README.md

@@ -86,6 +86,21 @@ sudo gitlab-rake gitlab:backup:create
 This will store a tar file in `/var/opt/gitlab/backups`. The filename will look like
 `1393513186_gitlab_backup.tar`, where 1393513186 is a timestamp.
+### Scheduling a backup
+
+To schedule a cron job that backs up your repositories and GitLab metadata, use the root user:
+
+```
+sudo su -
+crontab -e
+```
+
+There, add the following line to schedule the backup for everyday at 2 AM:
+
+```
+0 2 * * * /opt/gitlab/bin/gitlab-rake gitlab:backup:create
+```
+
 ### Restoring an application backup
 We will assume that you have installed GitLab from an omnibus package and run