Much to the dismay of every CFO, IT execs tend to be innovators and forward thinkers. It's not that CFO's despise innovation, they just despise what it costs them. When it comes to large scale WAN Acceleration, it's often going to cost you a lot. On an extremely large scale, WAN acceleration can often pay you back relatively quickly. However, when cash is an issue, and when capital budgets are tight, IT Managers might fare better thinking backward than forward.
It used to be that only large organizations would build DR sites or do storage replication for backup and/or redundancy. Today, even small organizations are demanding some form of highly available storage redundancy. Unfortunately, most SMBs lack the infrastructure and budget needed to do it the way their big business peers do.
Typically, most medium to large sized shops multiplex their storage replication traffic with other critical network services over one large pipe. In this scenario, acceleration can be a huge benefit (the forward thinking solution), but it's not the only approach, and acceleration is certainly not the cheapest solution.
If you're an SMB, think backward. For example, ask yourself if queuing is an option. Depending on the SAN you've invested in, you can often bandwidth throttle storage replication traffic at the SAN level. If you can do deduplication at the same time, even better. If your SAN can't bandwidth throttle the replication traffic, do it at the router level between SAN A and SAN B. If you're replicating into cloud storage, then implement a bandwidth quota on your firewall or internet router. Assuming you have some spare bandwidth to play with, you'd be surprised at how effective this approach can be.