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Comparison · Infra & APIs
BorgBackup vs eratosthenes
A side-by-side editorial comparison of BorgBackup and eratosthenes — release velocity, themes, recent moves, and the top alternatives to consider.
BorgBackup vs eratosthenes: at a glance
What is BorgBackup?
Borg's long-running 2.0 beta finally landed packs — and warned it dropped back to alpha quality.
Borg runs two trains in the same feed. The 1.4.x line is explicitly a refreshed 1.2 — same features and behaviour, with the riskier changes isolated so they could be tested before shipping — and it has taken over as the recommended branch since 1.2.9 was called the final 1.2 release. The 2.0 line has been in beta since well before this window, at b22 as of July 2026, with every release carrying a do-not-use-on-production warning. b22 introduced packs and the maintainers told users to expect alpha stability despite the beta number.
What is eratosthenes?
eratosthenes spends 0.1.0 hardening inputs rather than adding chronology methods.
eratosthenes does Bayesian estimation of archaeological chronologies from relative sequences, absolute constraints and artifact assemblages. The 0.0.9 line built out the inference diagnostics — traceplots, histograms, batch-means MCSE reporting, displacement estimation — and then consolidated artifact probability-density estimation into a single gibbs_ad_type(). The 0.1.0 tag turns outward instead, adding validators for every user-supplied structure and replacing seq_check() with a more informative seq_diag().
BorgBackup vs eratosthenes: editorial side-by-side
BorgBackup
6.3INFRA · APIS
Borg's long-running 2.0 beta finally landed packs — and warned it dropped back to alpha quality.
◆ Current state
Borg runs two trains in the same feed. The 1.4.x line is explicitly a refreshed 1.2 — same features and behaviour, with the riskier changes isolated so they could be tested before shipping — and it has taken over as the recommended branch since 1.2.9 was called the final 1.2 release. The 2.0 line has been in beta since well before this window, at b22 as of July 2026, with every release carrying a do-not-use-on-production warning. b22 introduced packs and the maintainers told users to expect alpha stability despite the beta number.
◆ Where it's heading
The split is the story: one branch exists purely to keep existing users safe and current, while the other rewrites how data is stored on disk. Packs are the kind of change that determines whether 2.0 ever ships — repository layout affects performance, resumability and every recovery path at once, and the honesty about stability regressing suggests the shakeout is still ahead. The 1.4 line will keep absorbing fixes and low-severity security work in the meantime, and the b18 corruption bug shows why the two trains are kept firmly apart.
◆ Prediction
Expect further 2.0 betas focused on packs stability before anything resembling a release candidate, with 1.4.x continuing to carry routine fixes for production users.
eratosthenes
2.5INFRA · APIS
eratosthenes spends 0.1.0 hardening inputs rather than adding chronology methods.
◆ Current state
eratosthenes does Bayesian estimation of archaeological chronologies from relative sequences, absolute constraints and artifact assemblages. The 0.0.9 line built out the inference diagnostics — traceplots, histograms, batch-means MCSE reporting, displacement estimation — and then consolidated artifact probability-density estimation into a single gibbs_ad_type(). The 0.1.0 tag turns outward instead, adding validators for every user-supplied structure and replacing seq_check() with a more informative seq_diag().
◆ Where it's heading
The package is moving from research code to something a non-author can run. Consolidating estimation behind one function, then wrapping every input class in a validator, are the two steps that make failures legible instead of cryptic, and the diagnostics added earlier serve the same end for the sampler itself. Nothing in the window changes the underlying model; the work is all about making it usable and its output checkable.
◆ Prediction
With inputs validated and diagnostics in place, the next release is more likely to extend the constraint or assemblage modelling than to keep reworking the interface, though the feed's three sparse tags give little to read a cadence from.
Alternatives to BorgBackup and eratosthenes
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either BorgBackup or eratosthenes.
forestploter
A forest plot package that keeps handing users control of one more graphical detail.
ggInterval
Interval-valued data plotting, spending 2026 making its function names and examples survive CRAN.
rgm
A microbiome network model that got itself un-archived by deleting the dependency that killed it.
contagionchannels
Three releases in ten days, every one of them a CRAN reviewer's correction rather than a code change.
tidyaudit
Pipeline provenance for tidyverse workflows, recording what changed at each step without keeping the data.
See all BorgBackup alternatives → · See all eratosthenes alternatives →
Recent activity from BorgBackup and eratosthenes
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 10d agoeratosthenesInput validators added; seq_check() replaced by seq_diag()
- 19d agoBorgBackup1.4.5: fixes, a low-severity security fix and small features
- 28d agoBorgBackup2.0.0b22 introduces packs — and warns stability regressed to alpha ⚡
- 4mo agoBorgBackup1.4.4 maintenance release
- 5mo agoBorgBackup2.0.0b21 beta, testing only
- 7mo agoBorgBackup2.0.0b20 beta, testing only
- 8mo agoBorgBackup1.4.3 maintenance release
- 1y agoeratosthenesArtifact p.d.f. estimation consolidated into gibbs_ad_type()
- 1y agoeratosthenesMCMC diagnostics arrive: traceplots, histograms, batch-means MCSE
Frequently asked questions
What is the difference between BorgBackup and eratosthenes?
They serve adjacent needs but don't currently overlap on shipped themes. BorgBackup is currently shipping more aggressively (velocity 6.3 vs 2.5), with 1 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is BorgBackup better than eratosthenes?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. BorgBackup is currently shipping more aggressively (velocity 6.3 vs 2.5), with 1 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to BorgBackup?
Top BorgBackup alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "BorgBackup alternatives" section above for the current picks, or visit /alternatives/borgbackup for the full list with editorial commentary on each.
What are the best alternatives to eratosthenes?
Top eratosthenes alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "eratosthenes alternatives" section above for the current picks, or visit /alternatives/eratosthenes for the full list with editorial commentary on each.