There are a few other things to consider as well such as making sure you've tested both failover and failback (in both directions). Many people assume that as long as the failover works then that's all that needs to be done. This is a big oversight. Be sure to test (and document) your procedures for getting things back up and running at your main site.
Also, if bandwidth is a concern for you, then look into wide-area network (WAN) acceleration technologies, or at least ensure your data is being compressed and you have a full and differential/incremental schedule setup so that the disaster recovery site is up to date and within your business tolerance.
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