Proxmox Backup Server V.4.1 Released

Open-source server solutions provider Proxmox Server Solutions GmbH announced the release of Proxmox Backup Server V.4.1.

This update is based on Debian 13.2 ‘Trixie’, bringing the latest Debian release with refreshed packages, better hardware support, and enhanced security. Backup Server 4.1 ships with Linux kernel 6.17 as the new stable default and includes ZFS 2.3 for reliable, enterprise-grade storage. The release also delivers major improvements in traffic control, verification performance, and S3-based backup operations.

Backup Server 4.1 Dashboard
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Highlights in Proxmox Backup Server 4.1:

• User-based traffic limiting for optimized bandwidth control
  Backup Server 4.1 extends the existing traffic control capabilities, which already allow administrators to limit backup and restore traffic for specific client networks. With this release, traffic control can additionally take the authenticated Proxmox Backup Server user into account. This enables more convenient and fine-grained prioritization of backup and restore workloads, for example by assigning higher backup bandwidth to business-critical services or separating production and test environments at the user level.
• Configurable parallelism for verify jobs
  Backup snapshot verification is both I/O- and CPU-intensive, as it reads backup data chunks from disk and validates their checksums. With version 4.1, administrators can configure the number of threads used for disk reads and checksum verification in verify jobs. Depending on the hardware and workload, this can significantly reduce verify runtimes and helps balance verification tasks against other resource-intensive operations.
• Bandwidth rate limiting for S3 endpoints
  Building on the native support for S3-compatible object storage introduced in Proxmox Backup Server 4.0, version 4.1 adds bandwidth rate limiting for S3 endpoints. Administrators can now cap the bandwidth used by backup and restore operations to and from S3 object stores. This helps prevent network congestion between Backup Server instances and the object storage infrastructure, especially in shared or bandwidth-constrained environments.

Backup Server V.4.1 Datastore Content
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Availability:
Proxmox Backup Server 4.1 is available for download. Users can obtain a complete installation image via ISO download, which contains the full feature set of the solution and can be installed quickly on bare-metal systems using an intuitive installation wizard.

Distribution upgrades from older versions of Proxmox Backup Server are possible using the standard APT package management system. Furthermore, it is also possible to install Backup Server on top of an existing Debian installation. As Free/Libre and Open Source Software (FLOSS), the entire solution is published under the GNU AGPLv3.

For enterprise users, Proxmox Server Solutions GmbH offers professional support through subscription plans. Pricing for these subscriptions starts at EUR 540/server per year, including unlimited backup storage and unlimited backup-clients. A subscription provides access to the stable Enterprise Repository with timely updates via the web interface, as well as to certified technical support. It is recommended for production use.