Getting Started with SQL Server 2008 R2 - Microsoft SQL Server 2008 R2 Administration - page 24

Save to DAC package file: It specifies the filename and path for the DAC
package file. This file must end with the .dacpac extension.

5. This is where the retrieval of database objects and relevant logins with checks of DAC

package can be created with a validation process.

6. The validation process ensures that all database objects are supported by a DAC, and

all dependent objects are available in the database. For example, if a view depends
on a table and the latter was dropped from the database, a DAC cannot be extracted.

7. When the validation completes, all issues and errors that prevent the creation of

a DAC package appear in the summary tree (refer to the next screenshot). If there
are no issues with the validation report, then click Next to create and save the DAC
package file.