Create a job in SQL Agent.

Job Step Type of SQL Server Analysis Services Command

Command below

<Batch xmlns="http://schemas.microsoft.com/analysisservices/2003/engine">

<Parallel>

<Process xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ddl2="http://schemas.microsoft.com/analysisservices/2003/engine/2" xmlns:ddl2_2="http://schemas.microsoft.com/analysisservices/2003/engine/2/2" xmlns:ddl100_100="http://schemas.microsoft.com/analysisservices/2008/engine/100/100" xmlns:ddl200="http://schemas.microsoft.com/analysisservices/2010/engine/200" xmlns:ddl200_200="http://schemas.microsoft.com/analysisservices/2010/engine/200/200">

<Object>

<DatabaseID>******************BUT YOUR CUBE DATABASE NAME HERE******************</DatabaseID>

</Object>

<Type>ProcessFull</Type>

<WriteBackTableCreation>UseExisting</WriteBackTableCreation>

</Process>

</Parallel>

</Batch>

Also ensure that you have given the SQL Agent account the access it needs on the right directories etc.