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Well, all I can say is this. I am working at a company where there are several sites, but the main site does just over 500TB/month and it is behind in the replication to one of the other sites. The problem is that the current system was undersized. It is currently running near 80% and we need to add another 900TB of backup volume to it....it's not going to fit.
If bandwidth were not a problem we would not be running behind in our replication. We have maybe 2 weeks capacity left and we need to do something different besides the replication. Now we are looking at going to tape for some of the less critical backup policies and we have to figure out how we can make that happen.
Personally I don't see how the cost can be justified. You pay double for the disk storage and then pay even more for the WAN connection. I'm sure it works OK for smaller volumes, but it does not seem to scale very well when you get into 125TB/week or more.