Moving Enterprise Vault to data center

Well you can probably start the copying of the data now, especially for Closed Partitions, because that data isn't gonna change much, unless you use collections, in which case it can change every so often.

Then when the time comes, you just do another copy based on differentials, like with Robocopy, you can have it only copy new items or items that have changed etc so you're not copying the full dataset.

Be sure to have full and proper backups incase something doesn't get copied properly or you're missing data, you will have it on the backup

Then after the server moves, you simply need to update the PartitionEntry table with the new locations of where the data now resides.

You definitely should go in to backup mode though whilst doing this, and would also suggest that you tell people there will be down time because theres not really much choice to have zero down time and let people work as they were before, because its possible you're going to be updating DNS and all sorts of things that may take time to propogate, and trying to troubleshoot why an item won't retrieve when you have so many moving parts can be problematic

But if you have the space now, i'd start copying the old partitions across as we speak, you could even try updating the PartitionEntry afterwards and seeing if you can recall items, that when when you do move, you have very little new data to finish migrating across