74 lines
3.9 KiB
HTML
74 lines
3.9 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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tt, code {
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background-color: #ecf0f3;
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color: #222;
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}
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pre, tt, code {
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font-family: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace;
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font-size: 0.9em;
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}
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div.note {
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background-color: #EEE;
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border: 1px solid #CCC;
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}
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</style>
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</head>
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<body>
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<p>A simulator to experiment with different backup schedules and prune
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options.</p>
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<h3>Schedule</h3>
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<p>Select weekdays with the combobox and input hour and minute
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specification separated by a colon, i.e. <code>HOUR:MINUTE</code>. Each of
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<code>HOUR</code> and <code>MINUTE</code> can be either a single value or
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one of the following:</p>
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<ul class="simple">
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<li>a comma-separated list: e.g., <code>01,02,03</code></li>
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<li>a range: e.g., <code>01..10</code></li>
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<li>a repetition: e.g, <code>05/10</code> (means starting at <code>5</code> every <code>10</code>)</li>
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<li>a combination of the above: e.g., <code>01,05..10,12/02</code></li>
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<li>a <code>*</code> for every possible value</li>
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</ul>
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<h3>Pruning</h3>
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<p>Prune lets you systematically delete older backups, retaining backups for
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the last given number of time intervals. The following retention options are
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available:</p>
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<dl class="docutils">
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<dt><code class="docutils literal notranslate"><span class="pre">keep-last</span> <span class="pre"><N></span></code></dt>
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<dd>Keep the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> backup snapshots.</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">keep-hourly</span> <span class="pre"><N></span></code></dt>
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<dd>Keep backups for the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> hours. If there is more than one
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backup for a single hour, only the latest is kept.</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">keep-daily</span> <span class="pre"><N></span></code></dt>
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<dd>Keep backups for the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> days. If there is more than one
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backup for a single day, only the latest is kept.</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">keep-weekly</span> <span class="pre"><N></span></code></dt>
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<dd>Keep backups for the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> weeks. If there is more than one
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backup for a single week, only the latest is kept.
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<div class="last admonition note">
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<p class="last"><b>Note:</b> Weeks start on Monday and end on Sunday. The software
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uses the <a class="reference external" href="https://en.wikipedia.org/wiki/ISO_week_date">ISO week date</a> system and handles weeks at
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the end of the year correctly.</p>
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</div>
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</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">keep-monthly</span> <span class="pre"><N></span></code></dt>
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<dd>Keep backups for the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> months. If there is more than one
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backup for a single month, only the latest is kept.</dd>
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<dt><code class="docutils literal notranslate"><span class="pre">keep-yearly</span> <span class="pre"><N></span></code></dt>
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<dd>Keep backups for the last <code class="docutils literal notranslate"><span class="pre"><N></span></code> years. If there is more than one
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backup for a single year, only the latest is kept.</dd>
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</dl>
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<p>The retention options are processed in the order given above. Each option
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only covers backups within its time period. The next option does not take care
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of already covered backups. It will only consider older backups.</p>
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<p>For example, in a week covered by <code>keep-weekly</code>, one backup is
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kept while all others are removed; <code>keep-monthly</code> then does not
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consider backups from that week anymore, even if part of the week is part of
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an earlier month.</p>
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</body>
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</html>
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