diff --git a/lib/qwik/act-sitebackup.rb b/lib/qwik/act-sitebackup.rb
index 8d71056..3b8a76e 100644
--- a/lib/qwik/act-sitebackup.rb
+++ b/lib/qwik/act-sitebackup.rb
@@ -102,9 +102,10 @@ def ext_tgz
   end
 
   class SiteBackup
-    TAR_CMD = '/bin/tar'	# path to tar command (GNU version is required)
+    TAR_CMD = %w(/bin/tar /usr/bin/tar).detect{|tar| tar.path.executable?} # path to tar command (GNU version is required)
+
     def self.command_exist?
-      TAR_CMD.path.executable?
+      !!TAR_CMD
     end
 
     def initialize(site, config)