Usenet Retention Comparison: Real-World Article Availability
How much Usenet retention do providers actually deliver? NZB Mentor compares real-world article availability across seven major Usenet backbones, measuring whether articles remain accessible as posts get older.
Unlike advertised retention figures, our measurements reveal how much content can actually be retrieved. Explore the results to understand the differences between Usenet backbones and their long-term article availability.
Article availability by post age
6.730 NZBs testedClick a backbone to hide or show it. Hover the chart to compare all backbones at one age.
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What Do Our Usenet Retention Results Show?
Our all-time retention comparison is based on more than 11.000 tested NZB files across seven Usenet backbones, covering posts up to approximately 18 years old.
The key takeaway: Our findings challenge the assumption that one backbone consistently outperforms all others. While Omicron leads across many post-age groups, Abavia and UsenetExpress demonstrate that competing backbones can deliver similar article availability, depending on the age of the content.
Omicron shows the strongest overall retention performance, maintaining article availability of approximately 80–90% across many post-age groups, including content more than ten years old.
However, the differences between backbones are not always as large as expected. Abavia and UsenetExpress achieve comparable article availability to Omicron in several post-age groups, occasionally matching or exceeding its results. This demonstrates that alternative backbones can offer competitive retention, particularly for certain post ages.
Giganews, Netnews, and Uzo Reto generally show lower availability than the leading backbones, but their results are often relatively close to one another. They also maintain substantial article availability across many older post-age groups.
Its Hosted stands out as an exception: availability drops sharply for posts older than approximately five to six years, remaining significantly below the other backbones across most older age groups.
Advertised Usenet Retention vs. Actual Article Availability
Usenet providers commonly advertise retention periods of 4,000, 5,000, or more than 6,000 days. These figures indicate how far back their article storage may extend, but they do not guarantee that every article within that period remains accessible.
Articles can become unavailable because of incomplete propagation, storage policies, removal requests, or other technical limitations.
For example, a provider advertising 6,000 days of retention may still have missing articles from much more recent posts.
Retention length and article availability are not the same thing.
That is why NZB Mentor measures actual article availability rather than relying solely on advertised retention figures.
Our comparison reveals how reliably different Usenet backbones provide access to articles across different posting periods. Learn how NZB Mentor measures article availability.
How to Choose a Usenet Backbone Based on Retention
The best Usenet backbone depends on the type and age of content you typically access.
For recent posts
If you primarily access recently posted content, long-term retention may be less important than download speed, pricing, and general article availability.
For older posts
If you frequently access older content, measured retention becomes much more relevant. A backbone maintaining high article availability across older posting periods may provide better results than one with impressive advertised retention figures but lower actual availability.
For improved coverage
Some users combine providers from different Usenet backbones. This can help when an article missing from one backbone is still available on another.
However, using multiple backbones does not guarantee successful downloads, particularly when the same articles are unavailable across several providers.
Our measurements help users make more informed decisions based on actual availability rather than marketing claims alone. Compare Usenet backbone performance over recent periods, or check NZB availability for a specific file.
Usenet Retention FAQ
What is Usenet retention?
Usenet retention refers to how long a provider stores articles and makes them accessible. It is typically advertised in days, but the stated retention period does not guarantee that every article remains available.
Which Usenet backbone has the best retention?
Based on NZB Mentor's current all-time measurements, Omicron demonstrates the strongest overall retention performance across many post-age groups. However, Abavia and UsenetExpress achieve comparable availability in several periods, making them competitive alternatives depending on the age of the content.
Does higher retention mean better NZB completion?
Not necessarily. High retention can improve access to older articles, but successful NZB completion depends on whether the required articles are available or missing segments can be repaired using recovery files such as PAR2.
Why are some Usenet articles missing?
Articles may be unavailable because of incomplete propagation, storage limitations, removal requests, or other technical factors. These differences can occur even when an article falls within a provider's advertised retention period.
Can a second Usenet backbone improve availability?
Yes. A backup provider on a different backbone may have articles that are missing from your primary provider. However, the benefit depends on whether the missing content is available elsewhere.
Is advertised Usenet retention reliable?
Advertised retention indicates the potential age of stored articles, but does not guarantee their availability. Independent measurements across different post ages provide a more informative picture of actual retention performance.