In short, yes it is. Upon thorough testing, we are happy to announce that the most recent DADman version for macOS (v. 5.4.5 build 1) is also working with macOS Big Sur, as well as Catalina (10.15), Mojave(10.14), High Sierra (10.13), Sierra (10.12), El Capitan (10.11) and Yosemite (10.10).
Please note! DADman 5.4.5 build 1 does not support new M1-based Mac computers, but it will run seamlessly on any Intel-based Mac.