[doc-units] document how interval value is parsed
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@ -376,10 +376,12 @@ if geographical replication is used.
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If this value is set, Garage will automatically take a snapshot of the metadata
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DB file at a regular interval and save it in the metadata directory.
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This can allow to recover from situations where the metadata DB file is corrupted,
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for instance after an unclean shutdown.
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See [this page](@/documentation/operations/recovering.md#corrupted_meta) for details.
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This parameter can take any duration string that can be parsed by
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the [`parse_duration`](https://docs.rs/parse_duration/latest/parse_duration/#syntax) crate.
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Snapshots can allow to recover from situations where the metadata DB file is
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corrupted, for instance after an unclean shutdown. See [this
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page](@/documentation/operations/recovering.md#corrupted_meta) for details.
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Garage keeps only the two most recent snapshots of the metadata DB and deletes
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older ones automatically.
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