Do you really want to enable copr.fedorainfracloud.org/copart/restic? [y/N]: y
Error: This repository does not have any builds yet so you cannot enable it now.
From what I can see in this error message is that your package manager is trying to fetch restic from a non-official repository.
And from the logs it doesn’t have any restic binary for you at all (?!).
So I would suggest you head over to the GitHub Page at https://github.com/restic/restic and go to the release and fetch the binary there directly instead.