Folks, Just a note that while RHEL10 isn't out yet, the pre-release CentOS Stream 10 which is the development side of it has been, and along with that EPEL-10 is also available and rdiff-backup 2.2.6 is available as part of it.
If you do want to download it, you probably will want python3-pylibacl from EPEL-10 and psutil and pyxattr in the base distro (appstream and crb respectively). You should also note that rdiff-backup will be updated to the latest version if when it is released, so be aware that the at some point it will only support the new syntax. Regards Frank