If you try and create an Integration Services Catalog and you receive the error SSISDBBackup.bak could not be accessed, it could be because you do not have Integration Services installed on your SQL Server instance.
If you try and create an Integration Services Catalog and you receive the error SSISDBBackup.bak could not be accessed, it could be because you do not have Integration Services installed on your SQL Server instance.
Jim Salasek's SQL Server Blog 