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hosts/nixos/noximilien/configuration.nix

@@ -32,7 +32,8 @@
     # ../../../profiles/services/tmate-server.nix # opens port 42244 # TODO: move outside of home net
 
     # TODO:
-    # ../../../profiles/backup
+    # ../../../profiles/backup/client
+    # ../../../profiles/backup/server.nix # setups the sftp user
 
     ../../../profiles/http # enables nginx+acme, defines mkDomain
     ../../../profiles/http/index

profiles/backup/client/default.nix

@@ -6,6 +6,32 @@ let
   sopsFile = lib.mkDefault ../../hosts/nixos/${hostName}/secrets.yaml;
 in
 
+# 3-2-1 Backup Rule:
+# * have 3 separate copies
+# * on 2 different media
+# * with 1 kept offsite
+
+# # borgbackup vs restic vs kopia vs diplicity
+# https://mangohost.net/blog/duplicacy-vs-restic-vs-borg-which-backup-tool-is-right-in-2025/
+# https://onidel.com/restic-vs-borgbackup-vs-kopia-2025/
+# https://www.reddit.com/r/BorgBackup/comments/v3bwfg/why_should_i_switch_from_restic_to_borg/
+# https://www.aarsen.me/posts/2022-02-15-sweet-unattended-backups.html
+#
+# restic:
+#   * native s3, go, decent restore, good deduplication, simplicity, decent backup/restore speed, slow prunes on huge repos
+# borgbackup:
+#   * clunky s3 (rclone), python/c, 1 machine per repo, backup goes brr, multiple encryption modes
+# kopia:
+#   * native s3, go, fast restore, restore goes brr, flexible key management, no nixos module
+# duplicity:
+#   * global deduplication, but global job, paid gui
+# zrepl:
+#   * requires zfs on both ends
+
+# TODO: can i make restic backup from a zfs snapshot for atomicity?
+#       https://www.aarsen.me/posts/2022-02-15-sweet-unattended-backups.html#pulling-it-together
+#       https://gist.github.com/stackcoder/ccb3b17812ed11700ee83d762b970b98
+
 {
   options = {
     pbsds.backup.paths = lib.mkOption {
@@ -15,7 +41,16 @@ in
   };
 
   imports = lib.map notInVM [
-    ./postgres.nix
+    # https://search.nixos.org/options?channel=unstable&query=backup
+    ./mysqlBackup.nix
+    ./postgresqlBackup.nix
+    # ./vaultwarden.nix # services.vaultwarden.backupDir
+    # ./gitea.nix # services.gitea.dump.enable
+    # ./forgejo.nix # services.forgejo.dump.enable
+    # stuff in /var/lib on nox:
+    # ./transmission.nix
+    # ./plex.nix
+    # ./thelounge.nix
   ];
 
   config = notInVM {
@@ -42,6 +77,8 @@ in
 
           # TODO: --skip-if-unchanged ?
           paths = [ "/var/lib" ] ++ config.pbsds.backup.paths;
+
+          # TODO: How should the timer behave on a laptop?
           timerConfig.OnCalendar = "hourly";
           pruneOpts = [
             "--keep-daily 5"
@@ -52,15 +89,15 @@ in
       in
       {
         "systems-meconium" = shared // {
-          # repository = "sftp:noximilien:/mnt/meconium/Backups/restic/system-${hostName}";
-          repository = "sftp:noximilien:/mnt/meconium/Backups/restic/systems";
+          # repository = "sftp:USER_TODO@noximilien:/mnt/meconium/Backups/restic/system-${hostName}";
+          repository = "sftp:USER_TODO@noximilien:/mnt/meconium/Backups/restic/systems";
           passwordFile = config.sops.secrets.restic_systems_password_meconium.path;
           # environmentFile = config.sops.secrets.restic_systems_environment_meconium.path;
         };
 
         "systems-panorama" = shared // {
-          # repository = "sftp:eple:/mnt/panorama/Backups/restic/system-${hostName}";
-          repository = "sftp:eple:/mnt/panorama/Backups/restic/systems";
+          # repository = "sftp:USER_TODO@eple:/mnt/panorama/Backups/restic/system-${hostName}";
+          repository = "sftp:USER_TODO@eple:/mnt/panorama/Backups/restic/systems";
           passwordFile = config.sops.secrets.restic_systems_password_panorama.path;
           # environmentFile = config.sops.secrets.restic_systems_environment_panorama.path;
         };

profiles/backup/client/mysqlBackup.nix

@@ -0,0 +1,24 @@
+{ lib, config, ... }:
+let
+  mkIf = lib.mkIf config.services.mysql.enable;
+in
+{
+
+  pbsds.backup.paths = mkIf [ config.mysqlBackup.location ]; # "/var/backup/postgresql"
+
+  services.mysqlBackup = mkIf {
+    enable = true;
+    databases = config.services.mysql.ensureDatabases;
+    # calendar = "*-*-* 01:15:00"; # nightly (default)
+
+    # there is now way to select no compression...
+    # should be trivial to fix ;)
+    # https://github.com/NixOS/nixpkgs/blob/89c2b2330e733d6cdb5eae7b899326930c2c0648/nixos/modules/services/backup/mysql-backup.nix#L23-L45
+    # https://github.com/NixOS/nixpkgs/pull/364630
+    # compressionAlg = "gzip";
+    # compressionAlg = "xz";
+    # compressionAlg = "zstd";
+    # compressionLevel = null;
+  };
+
+}

profiles/backup/server.nix

@@ -0,0 +1,3 @@
+
+# todo
+# some "restrict,pty,command=..." ssh authorized_keys bullshit to verify restic, or maybe even just host the REST server?