We are pleased to announce the first stable release of Proxmox Backup Server 4.0 - immediately available for download!
The new version is based on the great Debian 13 "Trixie" but we're using a newer Linux kernel 6.14.8-2 as stable default in Proxmox Backup Server, including ZFS 2.3.3.
We're incredibly proud of the hard work that has gone into this release and can't wait for you to experience it.
Some of the exciting new features we've packed into Proxmox Backup Server 4.0:
Beyond these major additions, we've also implemented numerous performance enhancements and bug fixes to make your experience even smoother. For a full list of changes, check out our release notes.
Release notes
https://pbs.proxmox.com/wiki/Roadmap
Press release
https://www.proxmox.com/en/news/press-releases
Download
https://www.proxmox.com/en/downloads
Alternate ISO download:
https://enterprise.proxmox.com/iso
Documentation
https://pbs.proxmox.com/docs/
Community Forum
https://forum.proxmox.com
Bugtracker
https://bugzilla.proxmox.com
Source code
https://git.proxmox.com
There has been a lot of feedback from our community members and customers, and many of you reported issues, submitted patches, and were involved in testing - THANK YOU for your support!
FAQ
Q: Can I upgrade latest Proxmox Backup Server 3 to 4 with apt?
A: Yes, please follow the upgrade instructions on https://pbs.proxmox.com/wiki/Upgrade_from_3_to_4
Q: Can I upgrade an 4.0 beta installation to the stable 4.0 via apt?
A: Yes, upgrading from beta to stable installation is possible via apt. We recommend switching to the
Q: How long will Proxmox Backup Server 3.4 receive bug fixes and security support?
A: Proxmox Backup Server 3.4 will receive security updates and critical bug fixes until August 2026. This support window provides an overlap of approximately one year after the release of Proxmox Backup Server 4, giving users ample time to plan their upgrade to the new major version.
For more information on the support lifecycle of Proxmox Backup Server releases, please visit:
https://pbs.proxmox.com/docs/faq.html#how-long-will-my-proxmox-backup-server-version-be-supported
Q: Why is Proxmox Backup Server 4.0 released ahead of the stable Debian 13 release?
A: Debian 13 is scheduled for its stable release this Saturday, August 9. Its core components have been stabilized since it entered the "hard freeze" phase on May 15. Following extensive integration testing and valuable feedback during the Proxmox Backup Server 4.0 beta, we are confident in the stability of this release. Since our core packages are either maintained directly by the Proxmox team or are already locked by Debian's strict freeze policy, there is no technical reason to postpone our release.
Q: How does this integrate into Proxmox Virtual Environment?
A: Just add a Proxmox Backup Server datastore as a new storage target in your Proxmox VE. Make sure that you run the latest Proxmox VE 8.4 or Proxmox VE 9.0.
Q: Is Proxmox Backup Server still compatible with older clients or Proxmox VE releases?
A: We are actively testing the compatibility of all the major versions currently supported, including the previous one. This means that you can safely back up from Proxmox VE 8 to Proxmox Backup Server 4, or from Proxmox VE 9 to Proxmox Backup Server 3. However, full compatibility with major client versions that are two or more releases apart, like for example Proxmox VE 7 based on Debian 11 Bullseye and Proxmox Backup Server 4 based on Debian 13 Trixie, is supported on a best-effort basis only.
Q: How do I install the proxmox-backup-client on my Debian or Ubuntu server?
A: We provide a "Proxmox Backup Client-only Repository". See https://pbs.proxmox.com/docs/installation.html#client-installation
For Debian derivatives we recommend installing the
Q: Is there any recommended server hardware for the Proxmox Backup Server?
A: We recommend enterprise-grade server hardware components, with fast local SSD/NVMe storage. Access and response times from rotating drives will slow down all backup server operations. See https://pbs.proxmox.com/docs/installation.html#recommended-server-system-requirements
Q: Can I install Proxmox Backup Server on Debian, in a VM, as LXC or alongside with Proxmox VE?
A:Yes, but all this is not the recommended setup (expert use only).
Q: Where can I get more information about feature updates?
A: Check the roadmap, forum, the mailing list, and/or subscribe to our newsletter.
The new version is based on the great Debian 13 "Trixie" but we're using a newer Linux kernel 6.14.8-2 as stable default in Proxmox Backup Server, including ZFS 2.3.3.
We're incredibly proud of the hard work that has gone into this release and can't wait for you to experience it.
Some of the exciting new features we've packed into Proxmox Backup Server 4.0:
- S3-compatible object stores as backup storage backend (technology preview).
- ZFS 2.3 with RAID-Z expansion.
- Automatically trigger sync jobs when a removable datastore is mounted.
- and more...
Beyond these major additions, we've also implemented numerous performance enhancements and bug fixes to make your experience even smoother. For a full list of changes, check out our release notes.
Release notes
https://pbs.proxmox.com/wiki/Roadmap
Press release
https://www.proxmox.com/en/news/press-releases
Download
https://www.proxmox.com/en/downloads
Alternate ISO download:
https://enterprise.proxmox.com/iso
Documentation
https://pbs.proxmox.com/docs/
Community Forum
https://forum.proxmox.com
Bugtracker
https://bugzilla.proxmox.com
Source code
https://git.proxmox.com
There has been a lot of feedback from our community members and customers, and many of you reported issues, submitted patches, and were involved in testing - THANK YOU for your support!
FAQ
Q: Can I upgrade latest Proxmox Backup Server 3 to 4 with apt?
A: Yes, please follow the upgrade instructions on https://pbs.proxmox.com/wiki/Upgrade_from_3_to_4
Q: Can I upgrade an 4.0 beta installation to the stable 4.0 via apt?
A: Yes, upgrading from beta to stable installation is possible via apt. We recommend switching to the
pbs-enterprise repository on upgrade for the most stable experience.Q: How long will Proxmox Backup Server 3.4 receive bug fixes and security support?
A: Proxmox Backup Server 3.4 will receive security updates and critical bug fixes until August 2026. This support window provides an overlap of approximately one year after the release of Proxmox Backup Server 4, giving users ample time to plan their upgrade to the new major version.
For more information on the support lifecycle of Proxmox Backup Server releases, please visit:
https://pbs.proxmox.com/docs/faq.html#how-long-will-my-proxmox-backup-server-version-be-supported
Q: Why is Proxmox Backup Server 4.0 released ahead of the stable Debian 13 release?
A: Debian 13 is scheduled for its stable release this Saturday, August 9. Its core components have been stabilized since it entered the "hard freeze" phase on May 15. Following extensive integration testing and valuable feedback during the Proxmox Backup Server 4.0 beta, we are confident in the stability of this release. Since our core packages are either maintained directly by the Proxmox team or are already locked by Debian's strict freeze policy, there is no technical reason to postpone our release.
Q: How does this integrate into Proxmox Virtual Environment?
A: Just add a Proxmox Backup Server datastore as a new storage target in your Proxmox VE. Make sure that you run the latest Proxmox VE 8.4 or Proxmox VE 9.0.
Q: Is Proxmox Backup Server still compatible with older clients or Proxmox VE releases?
A: We are actively testing the compatibility of all the major versions currently supported, including the previous one. This means that you can safely back up from Proxmox VE 8 to Proxmox Backup Server 4, or from Proxmox VE 9 to Proxmox Backup Server 3. However, full compatibility with major client versions that are two or more releases apart, like for example Proxmox VE 7 based on Debian 11 Bullseye and Proxmox Backup Server 4 based on Debian 13 Trixie, is supported on a best-effort basis only.
Q: How do I install the proxmox-backup-client on my Debian or Ubuntu server?
A: We provide a "Proxmox Backup Client-only Repository". See https://pbs.proxmox.com/docs/installation.html#client-installation
For Debian derivatives we recommend installing the
proxmox-backup-client-static package to avoid issues with different system library versions.Q: Is there any recommended server hardware for the Proxmox Backup Server?
A: We recommend enterprise-grade server hardware components, with fast local SSD/NVMe storage. Access and response times from rotating drives will slow down all backup server operations. See https://pbs.proxmox.com/docs/installation.html#recommended-server-system-requirements
Q: Can I install Proxmox Backup Server on Debian, in a VM, as LXC or alongside with Proxmox VE?
A:Yes, but all this is not the recommended setup (expert use only).
Q: Where can I get more information about feature updates?
A: Check the roadmap, forum, the mailing list, and/or subscribe to our newsletter.
