Question 1

What happens when Proxmox Backup Server reaches end of life?

Accepted Answer

When Proxmox Backup Server reaches end of life, it stops receiving security patches, bug fixes, and new features. Currently, 2 Proxmox Backup Server versions are already EOL. The latest supported version is Proxmox Backup Server 4. Running an EOL version exposes your systems to unpatched security vulnerabilities with no official fix available.

Question 2

Is Proxmox Backup Server 4 still supported?

Accepted Answer

Yes. Proxmox Backup Server 4 is actively supported. It receives security patches and bug fixes. Check the version table above for the full list of supported Proxmox Backup Server releases and their exact end-of-life dates.

Question 3

Is it safe to use Proxmox Backup Server after end of life?

Accepted Answer

No. Running Proxmox Backup Server after EOL is not safe for production systems. Once a version reaches end of life, newly discovered CVEs are published publicly but never patched — leaving your systems permanently exposed. The only safe path is upgrading to an actively supported Proxmox Backup Server release.

Question 4

How to upgrade from Proxmox Backup Server 2 to Proxmox Backup Server 4.x?

Accepted Answer

To upgrade Proxmox Backup Server from 2 to 4: (1) review the official migration guide for breaking changes, (2) test your application against the new version in a staging environment, (3) update dependencies that have version constraints, (4) run your full test suite, (5) deploy with a rollback plan. The earlier you start, the more time you have to resolve compatibility issues before EOL.

Question 5

When is the next Proxmox Backup Server LTS version?

Accepted Answer

Not all Proxmox Backup Server releases have a designated LTS status. Check the version table above — LTS releases are marked with an "LTS" badge. Refer to the official Proxmox Backup Server release policy for information on upcoming long-term support versions.

Question 6

How long does Proxmox Backup Server support each version?

Accepted Answer

On average, Proxmox Backup Server supports each release for approximately 33 months (~2.8 years).  The exact EOL date for each version is listed in the table above.

Version	Released	Active support	EOL date	Until EOL	Latest	CVEs	Status
4	Aug 6, 2025	—	No	—	4.2	—	Active
3	Jun 28, 2023	—	Aug 31, 2026	in 83d	3.4	—	EOL soon
2	Jul 13, 2021	—	Jul 31, 2024	678d ago	2.4	—	EOL
1	Nov 11, 2020	—	Sep 30, 2022	1348d ago	1.1	—	EOL

Proxmox Backup Server End of Life Dates

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