docs: rewrite disaster-recovery.md following the full standing process in order

Live-verified against real infrastructure: Kopia's real repo/disk,
PBS's real datastore path, os_update role's real batch/abort behavior
against the actual Ansible code, and the real tag-driven
roles_metadata.yml mechanism behind Layer 1's rebuild claim. Caught a
real KB staleness in the process (PBS datastore usage, 3 weeks stale)
and fixed it properly - removed the point-in-time number entirely
rather than refreshing it, since a data-snapshot doesn't belong in
Trilium at all per the existing content-philosophy rule. Replaced
both mermaid diagrams with real branch/decoupling-shaped Nextcloud
diagrams. All 3 source KB notes stamped.

assets/disaster-recovery-layers.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Do not edit this file with editors other than draw.io -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" style="background: transparent; background-color: transparent; color-scheme: light dark;" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="932px" height="383px" viewBox="0 0 932 383" content="&lt;mxfile host=&quot;embed.diagrams.net&quot; scale=&quot;1&quot; border=&quot;0&quot;&gt;&#10;  &lt;diagram name=&quot;Recovery Layers&quot; id=&quot;recovery-layers-1&quot;&gt;&#10;    &lt;mxGraphModel dx=&quot;1178&quot; dy=&quot;659&quot; grid=&quot;1&quot; gridSize=&quot;10&quot; guides=&quot;1&quot; tooltips=&quot;1&quot; connect=&quot;1&quot; arrows=&quot;1&quot; fold=&quot;1&quot; page=&quot;1&quot; pageScale=&quot;1&quot; pageWidth=&quot;1000&quot; pageHeight=&quot;440&quot; math=&quot;0&quot; shadow=&quot;0&quot;&gt;&#10;      &lt;root&gt;&#10;        &lt;mxCell id=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;1&quot; parent=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;loss&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#F5F5F5;strokeColor=#666666;fontColor=#333333;fontSize=13;fontStyle=1;shadow=1;&quot; value=&quot;Something is lost&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;180&quot; x=&quot;410&quot; y=&quot;20&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;gate&quot; parent=&quot;1&quot; style=&quot;rhombus;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;fontColor=#333333;fontSize=13;fontStyle=1;shadow=1;&quot; value=&quot;What kind?&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;110&quot; width=&quot;180&quot; x=&quot;410&quot; y=&quot;130&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;iac&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Layer 1: Infrastructure as Code&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;rebuilt via the same Packer -&amp;amp;gt; Terraform -&amp;amp;gt; Ansible pipeline that built it originally&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;80&quot; width=&quot;260&quot; x=&quot;40&quot; y=&quot;310&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;pbs&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Layer 2: Proxmox Backup Server&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;full-host snapshots&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;80&quot; width=&quot;260&quot; x=&quot;370&quot; y=&quot;310&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;kopia&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Layer 3: Kopia, volume-level&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;per-stack, isolated repository&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;80&quot; width=&quot;260&quot; x=&quot;700&quot; y=&quot;310&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;e1&quot; edge=&quot;1&quot; parent=&quot;1&quot; source=&quot;loss&quot; style=&quot;html=1;endArrow=block;strokeColor=#666666;strokeWidth=2;rounded=1;&quot; target=&quot;gate&quot;&gt;&#10;          &lt;mxGeometry relative=&quot;1&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;e2&quot; edge=&quot;1&quot; parent=&quot;1&quot; source=&quot;gate&quot; style=&quot;html=1;labelBackgroundColor=#1C1D1E;endArrow=block;strokeColor=#6c8ebf;fontColor=#6c8ebf;strokeWidth=2;rounded=1;fontSize=11;edgeStyle=orthogonalEdgeStyle;exitX=0.2;exitY=1;entryX=0.5;entryY=0;&quot; target=&quot;iac&quot; value=&quot;&amp;lt;span style=&amp;quot;background-color: light-dark(rgb(255, 255, 255), rgb(28, 29, 30));&amp;quot;&amp;gt;a host, entirely&amp;lt;/span&amp;gt;&quot;&gt;&#10;          &lt;mxGeometry relative=&quot;1&quot; x=&quot;0.118&quot; y=&quot;-19&quot; as=&quot;geometry&quot;&gt;&#10;            &lt;mxPoint as=&quot;offset&quot; /&gt;&#10;          &lt;/mxGeometry&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;e3&quot; edge=&quot;1&quot; parent=&quot;1&quot; source=&quot;gate&quot; style=&quot;html=1;labelBackgroundColor=#1C1D1E;endArrow=block;strokeColor=#82b366;fontColor=#82b366;strokeWidth=2;rounded=1;fontSize=11;&quot; target=&quot;pbs&quot; value=&quot;&amp;lt;span style=&amp;quot;background-color: light-dark(rgb(255, Line truncated

assets/disaster-recovery-upgrades.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Do not edit this file with editors other than draw.io -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" style="background: transparent; background-color: transparent; color-scheme: light dark;" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="1132px" height="272px" viewBox="0 0 1132 272" content="&lt;mxfile host=&quot;embed.diagrams.net&quot; scale=&quot;1&quot; border=&quot;0&quot;&gt;&#10;  &lt;diagram name=&quot;Upgrade Systems&quot; id=&quot;upgrade-systems-1&quot;&gt;&#10;    &lt;mxGraphModel dx=&quot;1178&quot; dy=&quot;659&quot; grid=&quot;1&quot; gridSize=&quot;10&quot; guides=&quot;1&quot; tooltips=&quot;1&quot; connect=&quot;1&quot; arrows=&quot;1&quot; fold=&quot;1&quot; page=&quot;1&quot; pageScale=&quot;1&quot; pageWidth=&quot;1100&quot; pageHeight=&quot;360&quot; math=&quot;0&quot; shadow=&quot;0&quot;&gt;&#10;      &lt;root&gt;&#10;        &lt;mxCell id=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;1&quot; parent=&quot;0&quot; /&gt;&#10;        &lt;mxCell id=&quot;osgroup&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;startSize=30;swimlane;fillColor=none;strokeColor=#6c8ebf;dashed=1;fontSize=13;fontStyle=1;fontColor=#333333;align=center;&quot; value=&quot;OS-LEVEL (os_update role)&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;270&quot; width=&quot;620&quot; x=&quot;40&quot; y=&quot;40&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;t1&quot; parent=&quot;osgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;VMs&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;3 at a time + network-critical host check&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;560&quot; x=&quot;30&quot; y=&quot;45&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;t2&quot; parent=&quot;osgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Proxmox nodes&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;1 at a time, aborts if anything&amp;#39;s mid-migration&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;560&quot; x=&quot;30&quot; y=&quot;120&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;t3&quot; parent=&quot;osgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Backup server&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;1 at a time, aborts if a backup job is running&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;60&quot; width=&quot;560&quot; x=&quot;30&quot; y=&quot;195&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;appgroup&quot; parent=&quot;1&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;startSize=30;swimlane;fillColor=none;strokeColor=#d79b00;dashed=1;fontSize=13;fontStyle=1;fontColor=#333333;align=center;&quot; value=&quot;APP-LEVEL (container_update / app_update)&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;240&quot; width=&quot;360&quot; x=&quot;810&quot; y=&quot;55&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;strategy&quot; parent=&quot;appgroup&quot; style=&quot;rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontColor=#333333;fontSize=12;fontStyle=1;shadow=1;&quot; value=&quot;Per-stack update strategy&amp;lt;br&amp;gt;&amp;lt;font style=&amp;quot;font-size: 10px;&amp;quot;&amp;gt;independent, unrelated checks&amp;lt;/font&amp;gt;&quot; vertex=&quot;1&quot;&gt;&#10;          &lt;mxGeometry height=&quot;80&quot; width=&quot;300&quot; x=&quot;30&quot; y=&quot;90&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;        &lt;mxCell id=&quot;e1&quot; edge=&quot;1&quot; parent=&quot;1&quot; source=&quot;osgroup&quot; style=&quot;html=1;labelBackgroundColor=#1C1D1E;endArrow=block;dashed=1;strokeColor=#b85450;fontColor=#b85450;strokeWidth=2;rounded=1;fontSize=12;&quot; target=&quot;appgroup&quot; value=&quot;&amp;lt;span style=&amp;quot;background-color: light-dark(rgb(255, 255, 255), rgb(28, 29, 30));&amp;quot;&amp;gt;completely separate concern&amp;lt;/span&amp;gt;&quot;&gt;&#10;          &lt;mxGeometry relative=&quot;1&quot; y=&quot;20&quot; as=&quot;geometry&quot; /&gt;&#10;        &lt;/mxCell&gt;&#10;      &lt;/root&gt;&#10;    &lt;/mxGraphModel&gt;&#10;  &lt;/diagram&gt;&#10;&lt;/mxfile&gt;&#10;"><defs/><g><g data-cell-id="0"><g data-cell-id="1"><g data-cell-id="osgroup"><g transform="transLine truncated