Hello Daniel. I get asked this same questions a lot and I would say a majority of the time I’m seeing customers going with Veeam or Unitrends. Both products have worked well for my customers where they repurposed their old SAN as a DR target for their new Nimble array.
We are currently using Zerto and have been quite impressed. We recently began migrating from EqualLogic at our main location to a pair of CS460s, but are keeping the DR site EqualLogic for now due to budget constraints. We will also be using Veeam replication for those VMs that we don't need quite the same level of recovery on, along with DataDomain replication to replicate our Veeam backup data.