You have a SharePoint Server 2010 server farm. You need to back up the Excel Services service
Application. The solution must minimize the size of the backup. What should you do?

A.
From Central Administration, click Perform a backup.

B.
From Central Administration, click Perform a site collection backup.

C.
From the command prompt, run stsadm.exe and specify the export operation.

D.
From the SharePoint 2010 Management Shell, run the backup-spslte cmdlet.

Explanation:
BURGOS MNEMO: “(backup) minimize the size” = “Perform a backup”
Back up a service application (SharePoint Server 2010)
http://technet.microsoft.com/en-us/library/ee428318.aspx#section2