diff --git a/src/restic/size.py b/src/restic/size.py
index 5228d4e..1d15a98 100644
--- a/src/restic/size.py
+++ b/src/restic/size.py
@@ -1,5 +1,6 @@
 import json
 import logging
+import os
 import subprocess
 
 import click
@@ -18,8 +19,21 @@ def get_size(loki_url: str = None):
         f'Total size: {data["total_size"] / 10**6:.2f} MB, {data["snapshots_count"]} snapshots'
     )
 
+    cmd = [
+        'du',
+        '--summarize',
+        '--bytes',
+        '--total',
+        os.environ['RESTIC_REPOSITORY'],
+    ]
+
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    size = int(result.stdout.split()[0])
+    data['disk_size'] = size
+
     if loki_url is not None:
-        send_to_loki(loki_url, result.stdout, backup='size')
+        send_to_loki(loki_url, json.dumps(data), backup='size')
+        logger.debug(json.dumps(data, indent=4))
 
 
 @click.command()