src/backup/prune.rs: implement --keep-hourly
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@ -425,12 +425,16 @@ following retention options:
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``--keep-last <N>``
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Keep the last ``<N>`` backup snapshots.
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``--keep-hourly <N>``
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Keep backups for the last ``<N>`` different hours. If there is more than one
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backup for a single hour, only the latest one is kept.
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``--keep-daily <N>``
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Keep backups for ``<N>`` different days. If there is more than one
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Keep backups for the last ``<N>`` different days. If there is more than one
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backup for a single day, only the latest one is kept.
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``--keep-weekly <N>``
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Keep backups for ``<N>`` different weeks. If there is more than one
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Keep backups for the last ``<N>`` different weeks. If there is more than one
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backup for a single week, only the latest one is kept.
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.. note:: The weeks start on Monday and end on Sunday. The software
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@ -438,11 +442,11 @@ following retention options:
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the end of the year.
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``--keep-monthly <N>``
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Keep backups for ``<N>`` different months. If there is more than one
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Keep backups for the last ``<N>`` different months. If there is more than one
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backup for a single month, only the latest one is kept.
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``--keep-yearly <N>``
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Keep backups for ``<N>`` different year. If there is more than one
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Keep backups for the last ``<N>`` different years. If there is more than one
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backup for a single year, only the latest one is kept.
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