Proxmox, known for the development of products Proxmox Virtual Environment and Proxmox Mail Gateway, announced the release of the distribution Proxmox Backup Server 4.0, which is presented as a ready-made solution for backup and restore virtual environments, containers, and server files. The installation ISO image is available for free download. The components specific to the distribution are open under the AGPLV3 license. For installation of updates, both the paid Enterprise repository and two free repositories are available, which differ in the level of stabilization of updates.
The system part of the distribution is based on the Debian and OpenZFS package base. The software stack for managing the backup is written in RUST and supports incremental backups, deduplication, compression (using ZSTD), and encryption of backup copies. The system is designed based on a client-server architecture – Proxmox Backup Server can be used for working with local backups and as a centralized server for backing up data from different hosts. Quick selective recovery and synchronization of data between servers are provided.
Proxmox Backup Server maintains integration with the Proxmox VE platform for reserving copying of virtual machines and containers, with control over reserve copies and data recovery through the web interface. Users have access to their data, and all traffic between customers and the server is encrypted using AES-256 in GCM mode. Backup copies are transmitted already encrypted using asymmetric encryption by open keys, ensuring data security. The integrity of backup copies is controlled using Hashi Sha-256.
In the new release:
- The transition to the District Package 13, with a default involvement of the Linux 6.14 kernel, is expected on August 9th.
- The version of OpenZFS 2.3.3 includes the ability to add new disks to an existing RAIDZ array, allowing for increased storage size without stopping work or creating a new group of drives. Automatic redistribution of excess data considering the new disks is carried out.
- An experimental backend for storing backups in objects compatible with the Amazon S3 API has been added.
- The possibility of automatically launching synchronization when mounting the extracted drive has been introduced, with configuration done by setting the RUN-ON-MOUNT flag for