Research Backup & Restore from etcd-druid

[kvaps]

etcd-druid was originally created as a solution for backing up and restoring etcd.
We have to research backup and restoration logic to answer the folowing questions

• Can we fully or partially adopt existing mechanisms from etcd-druid into our oprator
  • APIs and CustomResources
  • Binary helper for creating backups
  • Code and functions
• Prepare an API design for backups and restoring snapshots by our operator
• Prepare an logical design for backups and restoring snapshots by our operator