diff --git a/src/unisync/synchroniser.py b/src/unisync/synchroniser.py
index 9646c06..f3a6c2c 100644
--- a/src/unisync/synchroniser.py
+++ b/src/unisync/synchroniser.py
@@ -141,11 +141,11 @@ class Synchroniser:
             else:
                 other.append("Name *")
 
-            other.append([
+            other.extend([
                 "-backuploc",
                 backup.location,
                 "-maxbackups",
-                backup.max_backups,
+                str(backup.max_backups),
                 "-backupsuffix",
                 backup.backupsuffix,
                 "-backupprefix",