the old server and run <command>rsync</> again to update the copy with any

changes to make it consistent. You might want to exclude some

files, e.g. <filename>postmaster.pid</>, as documented in <xref

linkend="backup-lowlevel-base-backup">.

linkend="backup-lowlevel-base-backup">. If your file system supports

file system snapshots or copy-on-write file copying, you can use that

to make a backup of the old cluster, though the snapshot and copies

must be created simultaneously or while the database server is down.

</para>

<refsect2>