{"id":11,"date":"2004-09-08T22:52:23","date_gmt":"2004-09-08T20:52:23","guid":{"rendered":"http:\/\/ken.friislarsen.net\/blog\/?p=11"},"modified":"2004-09-08T22:52:23","modified_gmt":"2004-09-08T20:52:23","slug":"shared-snapshots","status":"publish","type":"post","link":"http:\/\/ken.friislarsen.net\/blog\/2004\/09\/08\/shared-snapshots\/","title":{"rendered":"Shared snapshots"},"content":{"rendered":"<p>Yesterday I bought an external hard-disk for backups.  To make the backups I&#8217;ve rolled my own script (<a href=\"http:\/\/ken.friislarsen.net\/blog\/images\/snapshot.sh\">snapshot.sh<\/a>) that uses <code>rsync<\/code> to make a snapshot of my home-partition and transfer it to the external hard-disk.  The interesting part is, that the script takes advantage of the <code>rsync<\/code> option <code>--link-dest<\/code> to share a large part of the snapshots using hardlinks.<\/p>\n<p> So after making three snapshots <code>du -sh<\/code> tells us that the snapshots takes up 25.3&nbsp;Gb of disk space:<\/p>\n<pre>\n8.5G    \/mnt\/external\/vips-backup\/snapshot.0\n8.4G    \/mnt\/external\/vips-backup\/snapshot.1\n8.4G    \/mnt\/external\/vips-backup\/snapshot.2\n<\/pre>\n<p>However, <code>df -h<\/code> tells us that only 8.6&nbsp;Gb of the external hard-disk is used:<\/p>\n<pre>\n\/dev\/sda1             187G  8.6G  179G   5% \/mnt\/external\n<\/pre>\n<p>Nifty, and with just 40 lines of bash scripting.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday I bought an external hard-disk for backups. To make the backups I&#8217;ve rolled my own script (snapshot.sh) that uses rsync to make a snapshot of my home-partition and transfer it to the external hard-disk. The interesting part is, that the script takes advantage of the rsync option &#8211;link-dest to share a large part of <a class=\"read-more\" href=\"http:\/\/ken.friislarsen.net\/blog\/2004\/09\/08\/shared-snapshots\/\">[&hellip;]<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,3],"tags":[],"class_list":["post-11","post","type-post","status-publish","format-standard","hentry","category-coding","category-general"],"_links":{"self":[{"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/posts\/11","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/comments?post=11"}],"version-history":[{"count":0,"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/posts\/11\/revisions"}],"wp:attachment":[{"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/media?parent=11"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/categories?post=11"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ken.friislarsen.net\/blog\/wp-json\/wp\/v2\/tags?post=11"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}