There is kasten by veeam.

Have a look at this product.

This is the best suggestion.

There are numerous ways to backup but it is very important to use Kubernetes native methods. So an agent on a node is not a good solution. You need to backup not only the persistent storage if you have it but various objects as well, like configmaps, secrets etc. Then you probably want to backup ETCD. On top of this you will want to export your local snapshots offsite to S3 or NFS. Kasten by veeam does all of this and more. check it out: https://www.kasten.io/