Disaster Recovery - creating a bank file during pay week

We are working on various Disaster Recovery processes, and one concern that has been raised is the creation of the bank (.lis) file in the event that our PeopleSoft system isn't available on our pay confirm date. Our goal is to still make sure people are paid, but our bank still requires a file to be submitted.

Does anybody have any ideas about ways to create a bank file before confirming the pay and generating the .lis file? I created a query that exports the net pay and bank account details into an Excel file, and we are emailing and saving that file daily during the pay week, but this Excel file isn't an .lis file, and the bank won't accept it.