Re: who uses it?
Mike Troiano here, I'm Actifio's CMO.
The short answer to your question is enterprises with 15TB-2PB of production data who find their storage requirements are growing too quickly; they're unable to ingest data fast enough to meet their internal SLA's; or the RTO or RPO objectives they can support using conventional technology just don't get the job done.
Most businesses today are dealing with a storage explosion. When you look closely at the data growth, you find production data growing at a linear rate, and "COPY DATA" - meaning data produced by all the systems that make copies of production (backup, snapshot, DR, BC, test & dev, analytics...) - growing geometrically. Copy data is what drives the storage explosion, because each of the systems that create it operate in a silo, creating copies without knowing what copies already exist. And while it's true there are plenty of systems out there to treat the symptoms of unchecked copy data growth (dedup, WAN optimization, etc.), Actifio is the first that cures the disease.
We do that by virtualizing some or all of the data protection apps I mentioned above. We replace those systems with a single one that makes a single, golden copy of whatever you'd like to protect in production, then stores incremental changes to it in such a way that you can recover anything instantly for up to 90% less than it would cost to do so through conventional means.
I hope that helps your brain stop hurting. If you'd like to know more, just ping me on Twitter @miketrap.