@olivierlambert @julien-f Hope it is included in backlog.May please confirm.

@olivierlambert Thanks for the detailed explanation . May please find the design of possibly achieving the the 2 way disaster recovery using pre existing functionality in the system:

1)Consider cluster1 as DC and cluster2 as DR.Distance between them 500 miles.
2) When customer selects CR , give the option/Checkbox "2 WAY ENABLE" .
3) After check the the checkbox of 2 way enable , Now despite the retention choosen by the customer , one last XO backup snapshot shall always existing
4) System starts sending the Delta to DR site

Now Disaster happens(Say power failures for few day and customer chooses for VM running in DR)

1. Now CR breaks(existing functionality), but a new snapshot to be automatically created first( and that would be permanent unless customer wishes to delete which would break 2 way DR completely) at DR site before VM starts running
2. VM runs for few days customer now chooses to go back to DC.
3. Now Clusters(at both sites would check existing of last mandatory snapshots and time stamp as well) .System finds that snapshot tome difference as, per schedule or less (i.e 10 mins). Good to go then.
4. Now DC site snapshot shall be applied in DC only and post successful application shall be considered as "seed" by DR site.
5. On the basis of permanent initial snapshot of DR( as was taken in step 1 and calculates Delta(VM may be powered off DR site first) and send to DC site for application and DONE !!! . We are back in DC using only existing functionalists and Deltas only .Only flows need to be revised.

Also since customer has chosen for DR , he/she understands that they would loose 10 mins of Data.

@olivierlambert many thanks for your reply.As I understand as per your reply and also as per your earlier replies on the post , there is complete necessity to transfer 100 tb plus 100gb back from Dr to dc site and there is currently no workaround for the same .May please confirm.

@olivierlambert Sorry for reigniting the old post.In above scenario imagine a situation in which:

1. disaster recovery site is 500 miles away and our primary site(having 100TB data) suffers power outage for next 3 days or so and
2. in the meantime we activate our disaster recovery site for next 3 days and it accumulates 10GB of data more
3. Now our primary site has 100TB data and DR site having (100TB + 10GB) data
4. As per my above understanding , that after 3 days when my primary site goes live and have to transfer (100TB + 10GB) data again and that too on low bandwidth.
5. This would then implicate that it would take several weeks to up my primary site
   Please suggest a more practical way to achieve "reverse DR" else person shall stuck in DR site like forever.