Setting up backup Bank in SAP HR

What are the steps to follow ?

The requirement is for business continuity purpose, HR Team like to setup a back up bank in the system .

Example: right now we have chase, and chase system is down for some reason, we need the citibank should already setup in system, so this is ok till QA, when ever Chase is down, we move the changes to Prod and citibank will be effective.

So what are the steps to setup and things to take care ? any flaws in above approach? I am going to create the Bank details from FI01 apart from that any further details from above, let me know, thanks

Any forms( like pay checks) to be changed?