Is there a robust way to determine whether a file “exists” in a repository without downloading any files? At the limit the only certain way would be to run a comparison against every equally sized file in every snapshot, but that’s obviously not practical. I know restic does not store a sha256 of the file itself, but it does store hashes of the blobs needed to construct that file for extraction. Could the sha256 hash of the file be reconstructed without downloading the file itself.