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  • Every backup is a full VM backup. #8907 and #9524 introduced the notion of incremental volume backups and incremental VM snapshots for the KVM plugin in ACS, respectively; thus, there should be support for incremental VM backups as well.

  • The plugin forces the user to use additional NFS storages NAS storages (NFS, CephFS, CIFS/Samba) in order to backup the VMs. As ACS already has the concept of secondary storages, which are storage areas separate from the primary storage, there is no need to add a new storage concept in order to perform backups, as backups can be copied to the secondary storage. Furthermore, we could extend the secondary storage selectors introduced in #7659 to allow backup storage selectors, thus giving control over where the backups will be saved to the operators. By avoiding extra configurations, we make the system more flexible and natural for cloud operators.

  • The backups are stored without any compression. Using the qemu-img tool, we could compress QCOW2 files to save space.

  • The backups are not validated neither during creation nor post-creation.

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