4000-initial-incremental.html

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   5 <h1>Initial qemu push-mode incremental backup</h1>
   6
   7 <ul>
   8   <li>drive-backup introduced in 2015</li>
   9   <li>create a new bitmap with a full backup</li>
  10   <li>future incremental backups use the prior state of the bitmap to
  11     create external file, as well as reset the bitmap</li>
  12 </ul>
  13
  14 <p>Initial state
  15   <table>
  16     <tr>
  17       <td style="vertical-align: top;">
  18         <table>
  19           <tr>
  20             <td style="font-size:20px;">Image.qcow2</td>
  21           </tr>
  22           <tr>
  23             <td>
  24               <table class="disk">
  25                 <tr>
  26                   <th>A</th><th>-</th><th>A</th><th>A</th>
  27                   <th>-</th><th>A</th><th>-</th><th>-</th>
  28                 </tr>
  29               </table>
  30             </td>
  31           </tr>
  32         </table>
  33       </td>
  34     </tr>
  35   </table>
  36 </p>
  37
  38 <p class="attribution">See also this 2015 KVM Forum presentation:
  39   <a href="https://www.youtube.com/watch?v=a2BNswm_yf8">Incremental
  40     backups: Good things come in in small packages!</a>, John Snow</p>