diff --git a/Formula/m/mackup.rb b/Formula/m/mackup.rb
index 717e0421eca29..581f8508bde7f 100644
--- a/Formula/m/mackup.rb
+++ b/Formula/m/mackup.rb
@@ -8,6 +8,9 @@ class Mackup < Formula
   license "GPL-3.0-or-later"
   head "https://github.com/lra/mackup.git", branch: "master"
 
+  # see discussions in https://github.com/lra/mackup/issues/2035,
+  # https://github.com/lra/mackup/issues/1924,
+  # and https://github.com/lra/mackup/discussions/1969#discussioncomment-8485995
   bottle do
     sha256 cellar: :any_skip_relocation, arm64_sonoma:   "dac4b2e6a5dbb4b99eeb476ca7a80d7b313dab3f733474ab24c6ad02bee7637e"
     sha256 cellar: :any_skip_relocation, arm64_ventura:  "dac4b2e6a5dbb4b99eeb476ca7a80d7b313dab3f733474ab24c6ad02bee7637e"
@@ -18,6 +21,9 @@ class Mackup < Formula
     sha256 cellar: :any_skip_relocation, x86_64_linux:   "edcad6afdb1201c9d64101252384cb1d5b61b5430cf5deabd184510d84f6b6da"
   end
 
+  deprecate! date:    "2024-08-19",
+             because: "Potential data loss on MacOS 14 (Sonoma) when using backup or restore command"
+
   depends_on "python@3.12"
 
   resource "docopt" do