If OnyX is a must have for Big Sur, take a look at this from the developer and donate. If it is worth using, it is worth supporting.
FULL DISCLOSURE; I have no relationship, pecuniary or otherwise with Titanium Software, the developer of ONYX, not even that of a user, but I believe in supporting good software.
Already did a few weeks ago. And it's also for that exact reason why I paid for SuperDuper!, even though I do not use its enhanced features.
