Is there anything out there that does continuous incremental backups to a remote location (like obnam, attic, ...) but allows "append only" access. That is, yo

Is there anything out there that does continuous incremental backups to a remote location (like obnam, attic, ...) but allows "append only" access. That is, you are only allowed to add to the backup, and the network protocol inherently does not allow past history to be deleted or modified? Pruning old backups might be allowed, but only using credentials that are reserved for special use. Obnam, attic and similar use a normal read/write disk area, without any server side processing, so presumably an errant/malicious user is free to delete the entire backup?