diff --git a/debian/rules b/debian/rules
index 657234c..06bd0e0 100755
--- a/debian/rules
+++ b/debian/rules
@@ -5,3 +5,9 @@
 
 %:
 	dh $@
+
+# TT#72908 Change permissions of /ngcp-data/backup/cdr to 0700
+# We want backups to only be readable by the root user, when possible.
+override_dh_fixperms:
+	dh_fixperms
+	chmod -v 0700 debian/ngcp-cleanup-tools-*/ngcp-data/backup/cdr