I just went through this, so I understand the pain...
If what you mean by "move historian files to new server" is migrate to a new gateway, this is what I referenced during my migration: Ignition Historian DB and migration to the new gateway
You will need to be comfortable executing some SQL scripts to get this done. I can provide more details if you're interested in exactly what I did, though calling IA support may be the best solution forward.
Some more details are needed to get what you need - What exactly is being migrated (GW or db or both)? What database type are you using? Where is the database located?