Due to a major shift in macOS architecture, Acronis True Image 2021 has the following limitations when installed on macOS 11 Big Sur:
Acronis True Image 2021 Update 1 for Mac (released on November 11, 2020):
1. Disk cloning temporarily unavailable for macOS 11 Big Sur and macOS 10.15 Catalina - see https://kb.acronis.com/content/67451
2. Boot Camp can be cloned only under bootable media - see https://kb.acronis.com/content/67265
Acronis True Image 2021 Update 2 for Mac (will be released at the end of November 2020):
1. Boot Camp can be cloned only under bootable media - see https://kb.acronis.com/content/67265