how does cyrus replication failover work?

[Thomas Vogt]

Hi

I've to move a large cyrus entity from one facility to another with no 
or at least a little downtime.

I thought I setup a second cyrus entity on my new data center and use 
cyrus replication to transfer all data to this new cyrus slave. After 
all mails are copied, the slave will become the primary backend server 
for a couple of hours. At this point I'll transfer my cyrus master to 
the new location (physical).

After everything is done, how do i copy all new mails from the slave 
back to my master who was offline for a couple of hours?

Regards,
Thomas