ZFS on Mac
ZFS is cool because it allows pooling of drives (more than one drive per volume), as well as compression and deduplication on the fly. Download and install from: https://openzfsonosx.org/ They do support older Mac OSes as well so that's good news too. To Format a disk, e.g. disk3, you type as follows on Terminal. It should automount after erasing. Bear in mind that if you turn on compression and deduplication the copying process is significantly slower. sudo diskutil eraseDisk HFS+ tempdisk /dev/disk3 sudo zpool create -f -o ashift=12 -O compression=lz4 -O dedup=on mypool /dev/disk3