Use FUSE (filesystem in userspace) to access rdiff-backup repository.
Access your files stored in OneDrive using
rclone command-line program to sync files and directories to and from cloud storage and FUSE Filesystem in Userspace filesystem.
fusermount: exec: "fusermount": executable file not found in $PATH by installing missing Filesystem in Userspace package.
I am surprised that exFAT is not supported out of the box as it is a default filesystem used on SDXC cards. You need to install a FUSE-based implementation to access data on devices using it.