>>106652370
disk clone copies at disk level, so 1/1 copy. whenever you update you copy entire disk
If you update frequently, better copy at file level.
I'm on linux so I use rsync, works on windows too.
# Music
rsync -r -t -p -o -g -v --progress --delete --stats -h /media/kurt/WD8/music/ /media/kurt/WD3/music/
# Video
rsync -r -t -p -o -g -v --progress --delete --stats -h /media/kurt/WD8/video/ /media/kurt/WD3/video/