improve cross ref between backups and pg (team#40950)

It's essentially the same as the first, but with `info` instead of

`check`.

## pgBackRest backup recovery

## Backup recovery

pgBackRest is our new PostgreSQL backup system. It features [restore

procedure](https://pgbackrest.org/user-guide.html#quickstart/perform-restore) and [restore command](https://pgbackrest.org/configuration.html#section-restore), and [detailed restore

## Restore PostgreSQL databases

See [howto/postgresql](howto/postgresql) for restore instructions on PostgreSQL databases.

See the [PostgreSQL documentation](howto/postgresql) for restore instructions on PostgreSQL databases.

## Restore MySQL databases

## Pager playbook

Hint: see also the [howto/postgresql](howto/postgresql) documentation for the backup

Hint: see also the [PostgreSQL pager playbook](howto/postgresql) documentation for the backup

procedures specific to that database.

### Out of disk scenario

 7. Once the base backup from step one is completed (or if there is no

    old director left), restore the cluster on the new host, see the

    "Indirect restore procedure" in [howto/postgresql](howto/postgresql)

    [PostgreSQL Backup recovery](howto/postgresql#backup-recovery) instructions

 8. You will also need to restore the file

    `/etc/dsa/bacula-reader-database` from backups (see "Getting files

therefore use postgres-specific configurations to do backups of all

our servers.

See [howto/postgresql](howto/postgresql) for that server's specific backup/restore

See [PostgreSQL backups reference](howto/postgresql#backups) for those server's specific backup/restore

instructions.

### MySQL backup system