init minecraft server configs!

modules/backup.nix

@@ -0,0 +1,61 @@
+{ config, pkgs, ... }:
+
+let
+  mcDataDir = "/srv/minecraft/data";
+  b2Bucket = "compsigh-minecraft-backups"; # TODO: change to your bucket name
+in
+{
+  systemd.services.minecraft-backup = {
+    description = "Backup Minecraft world to Backblaze B2";
+    after = [ "docker-minecraft.service" ];
+    path = [ pkgs.docker ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = pkgs.writeShellScript "minecraft-backup" ''
+        TEMP_BACKUP="/tmp/minecraft-world-latest.tar.gz"
+
+        # Check if the container is running
+        if ! docker ps --format '{{.Names}}' | grep -q '^minecraft$'; then
+          echo "Minecraft container not running, skipping backup"
+          exit 0
+        fi
+
+        # Flush all chunks to disk and pause saving
+        docker exec minecraft rcon-cli save-all flush
+        sleep 2
+        docker exec minecraft rcon-cli save-off
+
+        # Compress world data
+        ${pkgs.gnutar}/bin/tar czf "$TEMP_BACKUP" \
+          -C ${mcDataDir} world world_nether world_the_end
+
+        # Re-enable saving immediately
+        docker exec minecraft rcon-cli save-on
+
+        # Upload to B2 (overwrites the single backup file)
+        B2_ACCOUNT=$(cat ${config.age.secrets.b2-account-id.path})
+        B2_KEY=$(cat ${config.age.secrets.b2-application-key.path})
+
+        ${pkgs.rclone}/bin/rclone copyto \
+          "$TEMP_BACKUP" \
+          ":b2:${b2Bucket}/world-latest.tar.gz" \
+          --b2-account "$B2_ACCOUNT" \
+          --b2-key "$B2_KEY" \
+          --no-check-dest
+
+        # Clean up local temp file
+        rm -f "$TEMP_BACKUP"
+
+        echo "Backup uploaded to Backblaze B2 successfully"
+      '';
+    };
+  };
+
+  systemd.timers.minecraft-backup = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "*:00,30";
+      Persistent = true;
+    };
+  };
+}