From Sept. 11 to Hurricane Katrina, businesses have wrangled with the nuts and bolts of <A HREF="http://www.baselinemag.com/article2/0,1540,1995797,00.asp?kc=BLCIOEMLP080806CMS1">recovering from catastrophes.</A> Data replication software, which copies corporate information to an offsite location, is one of the key components of any disaster recovery plan. The market for tools that help companies replicate mission-critical applications and records is consolidating, with players like EMC, Network Appliance, and Symantec having gobbled up smaller competitors. And while many customers have found success with these vendors, some say the industry consolidation has led to problems with product development and customer support.