Solution 1:
Maybe the --compare-dest option of rsync could be helpful.
I think
rsync -av --progress --stats --compare-dest=/hdd2 /hdd1/ /3rd_dir/
might work.
Rsync difference between two directories to a 3rd directory
Solution 1:
Maybe the --compare-dest option of rsync could be helpful.
I think
rsync -av --progress --stats --compare-dest=/hdd2 /hdd1/ /3rd_dir/
might work.