From their website I see that Duplicati has a docker image available if you’re familiar with docker. They also have a fedora rpm that may or may not work here, and a generic zip file.
I do not use Duplicati or Docker, so this is all the info I can offer.
KopiaUI claims to support s3 connection but it does not work. When trying to create a repo it returns:
Connect Error: INTERNAL: internal server error: connect error: unable to write blobcfg blob: PutBlob() failed for “kopia.blobcfg”: unable to complete PutBlob(kopia.blobcfg) despite 10 retries: The specified key does not exist.