True Versus Near CDP
True versus near CDP
CDP technologies can be categorized as falling into one of two architectures: true CDP and near CDP. The "true" in "true CPD" signifies that this architecture does indeed deliver continuous data protection.
To do so, true CDP captures every production data write and transfers it to a secondary disk. It thus enables any update to be undone by recovering the data to a point in time immediately before the update was applied.
Near CDP is not continuous but, as the "near" implies, it is generally much closer to continuous than nightly backups. Near CDP batches updates and transmits them to the backup data store only at discrete points in time, such as when a file is saved or closed.
Depending on how the software selects these save points, this can provide the benefit of creating recovery points that are "clean" (that is, those that were not created when transactions were incomplete).
The disadvantage of near CDP is that, in some cases, the recovery points may be spaced several hours or more apart. In environments with high transaction volumes or rigid compliance or governance regulations, this may not be sufficient.