Update cheatsheets

tldr/gitlab-backup

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gitlab-backup
+
+> Manage backups for a GitLab Omnibus installation.
+> See also: `gitlab-ctl`, `gitlab-runner`.
+> More information: <https://docs.gitlab.com/administration/backup_restore/backup_gitlab/>.
+
+- Create a full backup (default strategy):
+
+`sudo gitlab-backup create`
+
+- Create a full backup using the copy strategy:
+
+`sudo gitlab-backup create STRATEGY={{copy}}`
+
+- Restore a backup by specifying its ID:
+
+`sudo gitlab-backup restore BACKUP={{backup_id}}`
+
+- Restore a backup while skipping specific components:
+
+`sudo gitlab-backup restore BACKUP={{backup_id}} SKIP={{db,uploads,...}}`