NetBackup Appliance OS 5.1 End of Life
Support dates and upgrade guidance — rebuilt from live data.
NetBackup Appliance OS 5.1 reached end of life on 8 Sept 2025. It no longer receives security fixes.
Support timeline
Official dates from the NetBackup Appliance OS release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 8 Feb 2023 | — |
| End of life | 8 Sept 2025 | 0.9 years ago |
| Latest release | 5.1.1 MR5 · 28 Aug 2024 | final |
Where to go from 5.1
Recommended target: NetBackup Appliance OS 5.5.
The newest actively supported branch is NetBackup Appliance OS 5.5 (latest release 5.5.0.1 MR1).
Frequently asked questions
Is NetBackup Appliance OS 5.1 still safe to use?
NetBackup Appliance OS 5.1 reached end of life on 8 Sept 2025, 335 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download NetBackup Appliance OS 5.1?
Yes — the final release (5.1.1 MR5) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade NetBackup Appliance OS 5.1 to?
Upgrade to NetBackup Appliance OS 5.5, the newest actively supported branch.