Added New Vault. Now What?

I am using ABR 11.5 VE (build 32266) on W2K8R2 Std Ed to backup 15 virtual machines on a 3 node W2K8R2 Datacenter Edition Failover Cluster.

Backups are currently performed to a local disk (D:\, 500 GB). I just installed a QNAP TS-469U (4 TB NAS) and attached as E:\ via iSCSI. I have exported an archive and it completed successfully so the bits and pieces seem to be working nicely together, thank you.

What I want to do is keep the latest backups locally on D:\ and automatically move backups GT 31 days to the vault on E:\.

If I modify my existing backup plan's retention rules, is ABR smart enough to move the existing backups on D:\ to E:\? Will I have to wait for the next scheduled backup for this to occur? Is ABR smart enough to merge the data gracefully?

--OR--

Should I export all my existing archives to E:\, delete the archives on D:\, then modify my plan's retention schedules?

Thanks,
Vint