So the entire array is full? You only need a drive big enough to hold how much data you have on the array. That was why he was asking. Though, transferring it to a single drive is risky in itself (at the least you want to verify the backup and keep the old array intact in case the restore is botched somehow). Also sounds like you want to do this while the array is being actively used? As far as I remember windows servers have a file locking feature that will allow you to get consistent backups on a filesystem that is in use but I’m not sure if that is available on the desktop? Was it called shadow copy? That might be the file versioning. I forget. But honestly it would be best to do the backup when it’s not in use if possible.
If you could have both the old array in the new array in your system at the same time the extra drive is unneeded as well, but kinda doubtful as these are NVME right?
Har, Har… a troll that doesn’t even work on Win10.