I am updating my external media and backup set up. Currently I have 1.2 TB on an external FW800 drive and want to migrate that to a USB 3.0 drive. The FW800 is 2TB and the USB 3.0 is 3TB. I have a new USB 3.0 that is 4TB that I will use to backup the Media drive and internal drive for offsite. For the migration process is it better for the drives that I copy the files in sections and give the drives time to "cool/rest" in between vs. a wholesale copy or using Carbon Copy Cloner? I've never migrated that much data before and don't know what strain that will put on the drive to go for that long. Thanks.