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SATA disk space is cheap. 16 disk JBOD enclosure and controllers (perfect for backup) filled with 3TB SATA-2 drives (48TB total) is £3,300. Downsize to 2TB drives giving 32TB backup and the price plummets to £1,600.
Nobody serious about DR and failover considers restoring back from the other site. They failover to that site instantly and then sort out the core problems at their leisure.
Yes, re-seeding the other side is an issue but how much space are we talking about for the average company? We've got 150 employees and our data could fit comfortably on two 3TB external USB-3 drives esp. if compressed. We'd stick TrueCrypt on there, copy at 140MB/s via USB-3 and courier them overseas.
It's not just about cost. In fact, in terms of business continuity, if you are constrained by cost, your managers have missed the point.
Cheers, Rob.