diff --git a/modules/backup/acronis-install.sh b/modules/backup/acronis-install.sh
index cd4f581..de6185f 100755
--- a/modules/backup/acronis-install.sh
+++ b/modules/backup/acronis-install.sh
@@ -215,7 +215,7 @@ echo ""
 echo -n "Proceed with installation? (yes/no): "
 read -r confirm
 
-if [ "$confirm" != "yes" ]; then
+if [[ ! "$confirm" =~ ^[Yy]([Ee][Ss])?$ ]]; then
     echo ""
     print_error "Installation cancelled"
     press_enter