• Failover is a backup mode in which the functions of a system, such as a server, database, network, or application, are automatically or manually transferred to a standby system when the primary system becomes unavailable due to a failure.
• The primary purpose of failover is to ensure high availability and minimal downtime for critical systems by switching to a redundant or standby system in case of failure. 
• In a failover, we switch to a temporary site due to a disaster at the source. Once the issue is resolved, we use fallback to switch back to the original source cluster. 
• Same we can do with SWIFT as below.
  • Go to the DR Policy under 'Business Continuity & DR' section and Select the DR policy you want to failover and fallback.

• Once you click on 'Failover' arrow, you will get some option to failover the policy.

• In the above snippet you can either select 'All' or 'Selective'.
  • If you select ALL then it will start for all DR operation
  • If you select 'Selective' , then it will failover for only selective operations.
  • Drill Mode: This can be used for testing of your actual DR drills.
  • Force Stage2 sync: You can use this option to run Stage2, even though Stage1 is not completed.
  • And Click on 'Failover'. 

• If you want to 'Fallback', go to the DR Policy section, select the DR policy that was failed over, and then click on the left direction arrow in SWIFT.

• Once you click on Left arrow , you will get fallback option windows to 'Fallback' selected operation.

• In the above snippet, you will see "All" and 'Selective' is the same as the Failover.
• If you can see the 'Reverse Sync' : If policy was the failover drill mode, then it won't do reverse sync like from DR site to the original prod side.
• Click on "Fallback". Now it will show like as below.