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 [Manage 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 *Policy*.

2. In the "Policy" menu, click on "Create New Policy."
!Policy Menu_Create New Policy item_English.png!

_or_

Select an existing policy from the list and click the "Edit" icon.

!Policies window_Edit icon_English.png!

3. The "Create New Policy"/"Edit Policy" window will open. Click the "Edit Schedule" button.

!Create New Policy_Disk Safe Verification Schedule_Edit Schedule.png!

4. The "Edit Verification Schedule" window will appear.

!Edit Verification Schedule window_Daily.png!

Here you can define the frequency and start time for the verification. There are four options available: on demand, daily, weekly, and monthly. You can set the specific time for the verification process depending on the selected trigger.
* *On Demand* \- If you select the "On Demand" option, the verification will not start automatically. You can run it manually at any desired time.

!Edit Verification Schedule window_On Demand.png!

* *Daily*

!Edit Verification Schedule window_Daily.png!
You can select the starting minute and hour(s). The verification will be launched every day at that time.

* *Weekly*

!Edit Verification Schedule window_Weekly.png!
You can select the start time and day(s). The verification will be launched every week at that time.

* *Monthly*

!Edit Verification Schedule window_Monthly.png!\|
You can select the start time and the exact day(s) of the month. The verification will be launched at that time.

5. Click "OK" to apply the settings.