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docs(backup): B2 lifecycle rule for hidden backups #71

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im-tyler merged 1 commit into from
Nov 6, 2026
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docs(backup): B2 lifecycle rule for hidden backups #71

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8 changes: 8 additions & 0 deletions README.md
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Expand Up @@ -837,6 +837,14 @@ aws s3api put-bucket-lifecycle-configuration --bucket B --lifecycle-configuratio

On B2 the same thing in its own terms is a lifecycle rule with `fileNamePrefix`
`PREFIX/.incoming/`, `daysFromUploadingToHiding` 1 and `daysFromHidingToDeleting` 1.
The S3 form above does not fit B2, which wants a paired rule per prefix.

B2 also keeps hidden versions forever by default, and a key without `deleteFiles` can only
hide, so backups that retention removes stay billed until a rule deletes them. Add a second
rule with `fileNamePrefix` `PREFIX/`, `daysFromHidingToDeleting` 30 and no
`daysFromUploadingToHiding`, which would hide live backups. Overlapping rules are allowed,
and B2 applies the smallest value of each property. The B2 application key needs `listFiles`,
`readFiles`, `writeFiles` and `readBucketLifecycleRules`.

The aws CLI must be at least 2.23.0 (or 1.37.0), the first to send a checksum on every
upload, which a bucket with Object Lock requires. An older one is refused with the remedy,
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