In particular, the possibility of reusing backed up data offers opportunities to mitigate the rising cost of data protection, and potentially even turn it into an asset.Innovations such as disk-based backup allowed you to retain existing processes, which usually mean scheduled backups, and to finish the job faster – or, in this world of spiralling data growth, to back up more data in the same amount of time.These changes, however, require new processes, new thinking, and probably new hardware and software too.Data growth has long since pushed us past the point where we can afford to treat all data equally.“The first thing to do is to take a step back and find all the data you have,” says Freeform Dynamics analyst Tony Lock.“Don't start by thinking about data protection. People have tended to protect all their data the same way. What you really need to ask is what are the protection requirements and what are the recovery requirements?”The recovery time and recovery point objectives (RTO and RPO) are the two key measures of whether your backup has any practical value. They measure your effective ability to recover your systems from backups.RPO is the length of time between backups (or protection events) and reflects how much recent data might be lost if a failure occurs. RTO is how long it takes to get the data back in place and ready to resume work, a process that can take longer using traditional backup technologies.

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Different data has different requirements, so just as you might have multiple tiers for production data depending on the performance needed, backups can be tiered too.At one extreme, relying on weekly backups destroys the RPO for hot data, while at the other feeding everything into a continuous data protection (CDP) appliance risks wasting an expensive resource on cold data.The chances are that you will need a combination of approaches, tailoring them to the needs of each class of data.“You want to keep the classification a simple as possible. Some things you need to back up only once a month, others you need to back up every week or every day, and there are some that might need CDP or a similar real-time approach,” says Lock.None of this is any good, however, if you don't protect all your applications and data, and recent seismic shifts make it difficult for IT professionals to know where all of their organisation's data is.Instead of simply being in the data centre, it could be in the cloud, on a departmental server or appliance or, perhaps worse of all, on a multitude of mobile devices wirelessly connected over a variety of public and private networks.

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“It is becoming converged data protection. We are crossing the boundary between endpoint backup and the likes of tiering and governance.”Lock agrees. “Data protection inevitably collects metadata and that can be turned into a content store, with appropriate governance layered on to control who can see what,” he says.He notes that several other multi-role products exist, such as CommVault's Simpana, which uses a single repository to support a range of services, including backup/restore, archiving and enterprise search. But he adds that even with the trend to converge backup and archiving, it is important to remember that those two main activities still have independent roles to play.“Data protection should be evolving toward generalised information management, but for most organisations backup is still an insurance policy,” he says.“I would argue there is still a role for traditional backup – for example, once you are making decisions on big data, you may be legally required to keep a copy of what went into that data pool.

“Archiving will grow and grow in importance, though. There's so much data on a live system that is not accessed frequently, but you don't know if you can afford to get rid of it."A collateral benefit of archiving that data off can be simpler and quicker backups, because you have shrunk your primary data.”The complexity involved in building such data protection systems is also leading more users towards an appliance approach. This is a prime area for startups and established storage vendors alike, as they compete to build the most effective and attractive combination of features into a single, easy-to-manage platform.For example Infrascale combines local backup for hot data with WAN acceleration and a cloud gateway for disaster recovery and archiving; and Rubrik claims its converged data management box can offload all those backup, versioning and data reduction tasks, again with cloud at the back end.