diff --git a/scripts/notify_backup.rb b/scripts/notify_backup.rb
index da95126..f493b96 100644
--- a/scripts/notify_backup.rb
+++ b/scripts/notify_backup.rb
@@ -69,7 +69,9 @@ class PayloadBuilder
       machine:           @options[:machine],
       destination:       @options[:destination],
       status:            @options[:status],
-      bytes_transferred: ByteFormatter.format(@options[:bytes]),
+      # Raw integer: the backup_runs datatable column is type number;
+      # human formatting belongs in the reporter, not the payload.
+      bytes_transferred: @options[:bytes],
       snapshot_id:       @options[:snapshot],
       log_path:          @options[:log_path],
       notes:             @options[:notes]
diff --git a/scripts/notify_backup_test.rb b/scripts/notify_backup_test.rb
index 30e340b..3559ff9 100644
--- a/scripts/notify_backup_test.rb
+++ b/scripts/notify_backup_test.rb
@@ -43,9 +43,9 @@ class PayloadBuilderTest < Minitest::Test
     assert_match(/\A\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z\z/, payload[:timestamp])
   end
 
-  def test_formats_bytes_to_human_readable
+  def test_sends_raw_integer_bytes
     payload = PayloadBuilder.new(base_options.merge(bytes: 1_073_741_824)).build
-    assert_equal '1.00 GB', payload[:bytes_transferred]
+    assert_equal 1_073_741_824, payload[:bytes_transferred]
   end
 
   def test_omits_nil_optional_fields
@@ -64,7 +64,7 @@ class PayloadBuilderTest < Minitest::Test
       notes: 'snapshot abc12345 saved'
     )
     payload = PayloadBuilder.new(opts).build
-    assert_equal '1.00 MB',    payload[:bytes_transferred]
+    assert_equal 1_048_576,    payload[:bytes_transferred]
     assert_equal 'abc12345',   payload[:snapshot_id]
     assert_equal '/home/jared/.local/log/restic/2026-05-07.log', payload[:log_path]
     assert_equal 'snapshot abc12345 saved', payload[:notes]