The page shows only the statements from the following list that relate to the chosen storage device:

• Device allows retention periods to be updated. Select the check box if the WORM device is configured to allow the extension of retention periods.

  If this check box is selected, then on request Enterprise Vault attempts to extend the item's retention period as stored on the device.

• Device performs data deduplication. Some devices can deduplicate data by storing a single copy of identical data blocks that different applications create. For example, Enterprise Vault and a backup application might create identical data blocks.

  If this check box is selected Enterprise Vault writes files in their native uncompressed format, which is a prerequisite for deduplication. You therefore lose the storage savings that Enterprise Vault compression normally provides. We therefore recommend that you select the check box only if all of the following conditions apply:

  • The device is configured to deduplicate stored data.

  • Multiple applications are likely to store identical data to the device.

  • The device both supports data compression and is configured to perform it.

  Otherwise the storage savings are likely to be greater if Enterprise Vault writes the files in compressed format.

• Device performs data compression. Select the check box only if the device is configured to compress data.

  If this check box is selected, Enterprise Vault does not compress data. If both Enterprise Vault and the device perform data compression there may be a considerable waste of CPU usage, and storage sizes may even increase.