There are a few options for backing up media on linux.
https://wiki.archlinux.org/title/dvdbackup
# information dvdbackup -i /dev/sr0 -I # perform backup dvdbackup -i /dev/sr0 -o <directory> -t <title number>
libdvd - https://help.ubuntu.com/community/RestrictedFormats/PlayingDVDs
to get a block copy, you can use dd