If you’re using LVM, ZFS, or Btrfs then you can use their features and tooling to migrate data from one disk to the other, assuming you’re able to connect both at the same time.
I’ve done this online with btrfs several times now and it’s quite painless, admittedly only for self hosted stuff.
I trialled both a while ago, chose ummich asits face recognition was superior.
There were other reasons, but I’ve forgotten them.