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This article is the final installment of a three-part series on disk-based data protection. The first two parts covered how to use disk to enhance traditional backup systems. The focus now turns to disk-based data protection options that could replace one or more parts of a backup system. The options include snapshots, replication, continuous data protection (CDP) and data reduction backup (DRB). These technologies will reduce backup and restore times, and help meet requirements such as RTO, RPO, backup window and synchronicity.
RTO--how long it takes to recover a system--can range from zero seconds to several days or even weeks. Each piece of information serves a business function, so the question is how long the business can live without that function. If the business can't live without it for one second, then the RTO is zero.
RPO is determined by how much data a business can afford to lose. If the business can lose three days' worth of a set of data, then the RPO is three days. If the data is real-time transactions essential to the business, the RPO is zero for that application.
There can also be an RPO for a group of machines. If several systems are related to each other, they may need to be recovered to the same point in time. This is the synchronicity requirement; to meet it, all related systems have to be backed up at exactly the same time.
This was first published in June 2005