K8up currently is optimized for PVs and will probably be able to backup objects in the future. It's not meant for cluster disaster recovery or full-cluster backup. (Deployment artefacts should anyways come from GitOps)
Stash was an inspiration for K8up. Unlike Stash, K8up is non-intrusive and doesn't add additional containers to Pods. It runs as k8s jobs besides the application Pods.
I can recommend APPUiO [0] which is a Swiss based container platform running OpenShift [1] and providing a full PaaS experience. The crew is reachable under [2], answering any questions in the chat. Disclaimer: I work for VSHN, the company behind APPUiO.