Btrbk: Difference between revisions

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@@ Line 33: / Line 33: @@
          target = "ssh://myhost/mnt/mybackups";
          subvolume = "nixos";
+        # "nixos" could instead be an attribute set with other volumes to
+        # back up and to give subvolume specific configuration.
+        # See man btrbk.conf for possible options.
+        /*
+        subvolume = {
+          home = { snapshot_create = "always"; };
+          nixos = {};
+        };
+        */
        };
      };
@@ Line 69: / Line 78: @@
 environment.systemPackages = [ pkgs.lz4 ];
+</nowiki>}}
+=== Local <code>/home</code> Snapshots ===
+{{Warning|This is not a backup solution alone. If the entire disk fails, local snapshots will be lost along with it.}}
+If <code>/home</code> is its own subvolume and important files are backed up separately or combined with the above section, this configuration takes snapshots hourly, retains them for at least a week, and keeps weekly snapshots for two weeks under <code>/snapshots</code>.
+{{file|/etc/nixos/configuration.nix|nix|<nowiki>
+services.btrbk = {
+  instances."home" = {
+    onCalendar = "hourly";
+    settings = {
+      snapshot_preserve_min = "1w";
+      snapshot_preserve = "2w";
+      volume = {
+          "/" = {
+            snapshot_dir = "/snapshots";
+            subvolume = "home";
+          };
+        };
+      };
+  };
+};
+# Btrbk does not create snapshot directories automatically, so create one here.
+systemd.tmpfiles.rules = [
+  "d /snapshots 0755 root root"
+];
 </nowiki>}}