According to <a href=”http://www-12.lotus.com/ldd/doc/domdoc/6.5.1/ddmadmgd.nsf/b3266a3c17f9bb7085256b870069c0a9/01886823ac30e26f05256e28005ee8cf?OpenDocument”>This site</a>:
<pre>Control groups are lists of objects that share common archive characteristics. </pre>
The site has a lot more information about BMRS. More information can be found <a href=”http://www-03.ibm.com/systems/i/support/brms/domcopyctlgs.html”>here</a> and an online class is available <a href=”http://www.microtrain.net/ibm_courses/course/backup-and-recovery-media-services-brms-for-system-i-ibm-137.html”>here</a>.
To put it in simpler terms – a BRMS “control group” defines what you want BRMS to do when it runs a backup process. BRMS comes with three “default” groups – *BKUGRP to back up all user data, *SYSGRP to back up all system data, and *SYSTEM to back up the entire box.
You can define your own groups, it is easiest to copy an existing group and modify the copy. I generally start with the *BKUGRP as it already is set up to backup user data