feat: move bakcups to backblaze

modules/backup.nix

@@ -2,7 +2,7 @@
 
 let
   mcDataDir = "/srv/minecraft/data";
-  b2Bucket = "compsigh-minecraft-backups"; # TODO: change to your bucket name
+  b2Bucket = "compsigh-server-backups";
 in
 {
   systemd.services.minecraft-backup = {
@@ -12,6 +12,8 @@ in
     serviceConfig = {
       Type = "oneshot";
       ExecStart = pkgs.writeShellScript "minecraft-backup" ''
+        set -euo pipefail
+
         TEMP_BACKUP="/tmp/minecraft-world-latest.tar.gz"
 
         # Check if the container is running
@@ -25,9 +27,13 @@ in
         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
+        # Compress world data (re-enable saving even if tar fails)
+        if ! ${pkgs.gnutar}/bin/tar czf "$TEMP_BACKUP" \
+          -C ${mcDataDir} world world_nether world_the_end; then
+          echo "tar failed, re-enabling saving"
+          docker exec minecraft rcon-cli save-on
+          exit 1
+        fi
 
         # Re-enable saving immediately
         docker exec minecraft rcon-cli save-on