From abf56b1de8d8526f37f82bbfdd7bb2840b4f6b09 Mon Sep 17 00:00:00 2001
From: Daniel Langbein <daniel@systemli.org>
Date: Wed, 4 Oct 2023 14:43:57 +0200
Subject: [PATCH] btrbk: local backups

---
 modules/btrbk/README.md   |  2 ++
 modules/btrbk/default.nix | 49 +++++++++++++++++++++++++++++++++++----
 2 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/modules/btrbk/README.md b/modules/btrbk/README.md
index ff2cae0..2abef6f 100644
--- a/modules/btrbk/README.md
+++ b/modules/btrbk/README.md
@@ -241,8 +241,10 @@ Another remote backup server periodically pulls snapshots to create remote backu
 ```shell
 cat > ~/btrbk.cfg <<'EOF'
 timestamp_format    long
+stream_compress     lz4
 ssh_identity        /mnt/backup/rootnas_ed25519
 
+# Create backups.
 target_preserve_min no
 # Daily backups -> @daily cron entry
 target_preserve          7d 4w 6m
diff --git a/modules/btrbk/default.nix b/modules/btrbk/default.nix
index 32ac231..66a8fad 100644
--- a/modules/btrbk/default.nix
+++ b/modules/btrbk/default.nix
@@ -6,11 +6,12 @@
   #   #=> btrbk-<instance-name>.service
   #   #=> btrbk-<instance-name>.timer
   #
-  # If onCalendar is set to null, one can manually execute btrbk with
+  # If onCalendar is set to `null`, one can manually execute btrbk with
   #   sudo systemctl start btrbk-<instance-name>.service
 
   # Print generated systemd unit file
   #   cat "$(systemctl show -P FragmentPath btrbk-<instance-name>.service)"
+  #   #=> ExecStart=/nix/store/53nvbl1c0w14524j7v3fpn9py31yi2hb-btrbk-0.32.6/bin/btrbk -c /etc/btrbk/local-backup.conf run
 
   services.btrbk = {
     extraPackages = [ pkgs.lz4 ];
@@ -19,16 +20,16 @@
     # Set of btrbk instances. The instance named btrbk is the default one.
     instances = {
 
-      "local-snapshots" = {
+      "local-snapshot" = {
         onCalendar = "hourly";
         #onCalendar = "*:0/15"; # Every 15min
 
         settings = {
           timestamp_format = "long";
-          stream_compress = "lz4";
+          #stream_compress =  "lz4";
 
           snapshot_preserve_min = "2d";
-          snapshot_preserve = "24h 7d 4w 6m";
+          snapshot_preserve =     "24h 7d 4w 6m";
 
           volume."/mnt/data/data" = {
             snapshot_dir = "/mnt/data/snap";
@@ -36,6 +37,46 @@
               "arch.p1st.de" = {};
               "blogger.privacy1st.de" = {};
               "changedetection.p1st.de" = {};
+              # MediaKollektiv: 796 GiB
+              "cloud.media-kollektiv.eu" = {};
+              "cloud.privacy1st.de" = {};
+              "git.privacy1st.de" = {};
+              #"mastodon-toot-follower.privacy1st.de" = {};
+              "money.p1st.de" = {};
+              "music.privacy1st.de" = {};
+              #"paste.p1st.de" = {};
+              "proxy" = {};
+              "recipe.privacy1st.de" = {};
+              "traggo.privacy1st.de" = {};
+            };
+          };
+        };
+      };
+
+      "local-backup" = {
+        # Run daily, 5 minutes after `local-snapshot` 0'o'clock timer.
+        onCalendar = "00:05";
+
+        settings = {
+          timestamp_format = "long";
+          #stream_compress =  "lz4";
+
+          # Create backups.
+          target_preserve_min = "no";
+          target_preserve =     "7d 4w 6m";
+
+          # Don't create or delete snapshots.
+          snapshot_preserve_min = "all";
+          snapshot_create       = "no";
+
+          volume."/mnt/data/data" = {
+            snapshot_dir = "/mnt/data/snap";
+            target = "/mnt/backup/snap";
+            subvolume = {
+              "arch.p1st.de" = {};
+              "blogger.privacy1st.de" = {};
+              "changedetection.p1st.de" = {};
+              # MediaKollektiv: 796 GiB
               "cloud.media-kollektiv.eu" = {};
               "cloud.privacy1st.de" = {};
               "git.privacy1st.de" = {};