Makemkv

Makemkv is the most popular tool for backing up DVD, Bluray and Bluray 4k Disks.

Makemkv has been in a state of perpetual beta that requires you to download a fresh copy on a set schedule If you want to support the software and eliminate the expiring beta copies you can purchase it.

4k Notes:

Makemkv does support backing up 4k Bluray dics but does require specific drives and firmware combinations. Specific info, how to guides etc can be found in the Makemkv forum here.