Discussed about Automatic Evac (HA). We were unsure about what to do when a local storage goes down. Do we restore the instances from backups to a new node? In that case a DB server might lose important transtactions. So we could also wait until it is fixed.

Would like Rutger to explain the Freenet BGP load balancing setup in more detail. How do the routers work, what are all those interfaces attached to them?

A local storage disk backup is stored as a QCOW2 image. An incremental has a relationship to its parent, because they neged to be rebased onto each other.
A volume disk backup is stored as raw data and is accompanied by a file of checksums per block. The extra file is used both to track dirtied blocks for incremental backup.