- Target dedupe systems allow customers to send traditional backups to a storage system that will then dedupe them; they are typically used in medium to large data centers and perform at high speed.
- Source dedupe systems use different backup software to eliminate the redundant data from the very beginning of the process and serve to back up remote offices and mobile users.
Backing up as you go CDP (continuous data protection) is another increasingly popular disk-based backup technology. Think of it as replication with an Undo button. Every time a block of data changes on the system being backed up, it is transferred to the CDP system. However, unlike replication, CDP stores changes in a log, so you can undo those changes at a very granular level. In fact, you can recover the system to literally any point in time at which data was stored within the CDP system.
A near-CDP system works in similar fashion except that it has discrete points in time to which it can recover. To put it another way, near-CDP combines snapshots with replication. Typically, a snapshot is taken on the system being backed up, whereupon that snapshot is replicated to another system that holds the backup. Why take the snapshot on the source before replication? Because only at the source can you typically quiesce the application writing to the storage so that the snapshot will be a meaningful one.
Read more about how to modernize your backup systems in InfoWorld's free PDF report, "Backup Infrastructure Deep Dive," including:
- Protecting transaction systems
- Protecting email systems
- Reducing risk with encryption
- Protecting virtualized enviroments
Read more about storage in InfoWorld's Storage Channel.