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Some experts contend that DR systems should be at least 40 miles apart. I don't buy in to that as a hard spec, but I would encourage you to consider locating the systems so that a regional issue -- weather, service provider (power, Telco), etc. -- would be extremely unlikely to affect both locations. There may be more cost-effective bandwidth options that T1 lines. Consult your local Telco providers for details. I don't know the monthly fee but our MAN (Metropolitan Area Network) was recently upgraded to full gigabit (GigaMAN service). Also, when you buy the bandwidth do a study to determine how much you'll actually need. If you're on a 720 supporting 100 users today you won't need a very big machine. You're probably a P20 tier now; I wouldn't be surprised if you dropped to a P10 on the new hardware. I second Steven's suggestion about the BP. Besides a source for hardware you can use them as a source for the HA software and implementation services.
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