Continuous data protection (CDP) is a backup methodology that
continuously tracks and records data modifications independently of
the primary data, enabling recovery from any point within a
configurable window of time. Since the software is continuously
running, every time a file changes CDP logs that change. This allows
a CDP-protected system to roll back any changes to the system at any
time.
CDP is best suited for those with high-value, time-sensitive
data sets. Typically, such data is coupled with very ambitious
recovery point objectives and recovery time objectives (RPOs and
RTOs).
Real-time replication is similar to CDP in that data changes on
the source server(s) are captured and journaled as they occur. These
changes are then replicated to (or mirrored to) the
destination server.
One potential drawback with a pure replication solution occurs
when data on the source server becomes corrupted. If this data
exists in the replication data set, the corrupted data is propagated
to the destination server, overwriting earlier, uncorrupted data. A
critical advantage offered by CDP technology is the ability to
recover to a point just prior to the moment when data corruption
occurred.
BakBone's NetVault: TrueCDP allows you to continuously capture
byte-level file system changes in real time. NetVault: TrueCDP
offers a choice of any-point-in-time (APIT), as well as
fixed-point-in-time (FPIT), snapshot data recovery for Linux
environments.
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