Schedule Disk Safe verification

*Disk Safe Verification* is targeted at detecting and alerting the user in the event of any possible corruption in a Disk Safe. Disk Safe Verification (DSV) runs on *a separate schedule* for each Policy to occasionally inspect the Disk Safe for any signs of corruption. 

Once the Disk Safe Verification procedure has been started, you will see DSV tasks in the [Task History]. The default DSV schedules should be appropriate for most users, but in some cases, DSV tasks will need to be run more or less frequently depending on factors that may, for example, include the following:

* How busy the Backup Manager server is (i.e., how many servers it is backing up)
* How important it is to ensure that no possible corruption has taken place

When run, DSV will hash and compare block data in the Disk Safe to the hashes that were stored for the block data when written to the Disk Safe. If the hashes no longer match, the data has been altered/corrupted, and an alert will be created in the Policy to inform the user. If a Disk Safe Verification task detects corruption, the Backup Agent will run a full block scan to verify every possible changed block and will send back any changed blocks. This will ensure that there is a full, consistent Recovery Point in the Disk Safe after the very next backup following the detection of an issue in the Disk Safe.

It is recommended to carefully consider the necessity of being able to restore data from a particular server, and to ensure that the DSV schedule is set accordingly. On business-critical servers, a slightly more frequent DSV schedule may be appropriate, and on a web server, for example, the DSV schedule frequency may be reduced pretty significantly. It is also possible to disable DSV for a Disk Safe entirely, but it is not recommend to do so.

Follow the instructions below to schedule a Disk Safe Verification.

1. In the Main menu, click *Settings* and then *Policies*.

2. On the _Policies_ screen, click the *+ New Policy* button to add a new policy.

_or_

To edit the schedule for an existing policy, click the corresponding _Actions_ icon and click *Edit Policy*. !Policies - Add Edit.png|border=1!
The _Create New Policy_/_Edit Policy_ window displays. The fields are identical in each of these windows.

3. In the _Create/Edit Policy_ window, select the _Advanced Policy Settings_ tab and click the *Edit Schedule* button in the _Disk Safe Verification Schedule_ section. !Create New Policy - Disk Safe Verification.png!

The _Edit Verification Schedule_ window displays.

4. In this window, you can define the frequency and start time for the Disk Safe verification. There are five options available in the *Verification Frequency* field: _On Demand_, _Daily_, _Weekly_, _Monthly_, and _Yearly_. You can set the specific time for the verification process depending on the selected trigger.

!Edit Verification Schedule - Weekly.png!
* *On Demand* \- The verification will not start automatically. You can run the Disk Safe verification manually at any desired time.
* *Daily* \- The verification runs on a daily schedule. You can select the starting minute and hour in the corresponding fields. The verification will be launched every day at that time.
!Edit Verification Schedule - Daily.png!

5. Click *OK* to apply the settings. The Disk Safe verification schedule is set.
{excerpt:hidden=true}Instructions on how to schedule Disk Safe verification in Server Backup Manager.{excerpt}