Docs: minor update for backup with NetBackup
<body>
<section>
<p>You install and configure NetBackup client software on the Greenplum Database master host
- and all segment hosts. </p>
+ and all segment hosts. The NetBackup client software must be able to communicate with the
+ NetBackup server software.</p>
<ol id="ol_ojl_gbz_3p">
<li>Install the NetBackup client software on Greenplum Database hosts. See the NetBackup
installation documentation for information on installing NetBackup clients on UNIX
