LPS-34579

* Nexus uses file system storage vs Artifactory which could connect to a DB.

Backing up the Nexus repo would be simply copying the sonatype-work directory
http://blog.sonatype.com/people/2011/06/nexus-tips-and-tricks-backup-nexus/
http://java.dzone.com/articles/maven-repository-manager-nexus

* We can have our single repository route to jboss-nexus, jboss-thirdparty, maven2, ow2-public, primefaces, etc by modifying the config.

```
 <repository>
  <id>primefaces</id>
  <name>primefaces</name>
  ..
  <remoteStorage>
    <url>http://repository.primefaces.org/</url>
  </remoteStorage>
  ..
</repository>

<repository>
  <id>liferay</id>
  <name>liferay</name>
  <providerRole>org.sonatype.nexus.proxy.repository.GroupRepository</providerRole>
  ..
  <externalConfiguration>
    <memberRepositories>
      <memberRepository>primefaces</memberRepository>
    </memberRepositories>
  </externalConfiguration>
</repository>
```