diff --git a/seed/base-machine/manual/install/backup b/seed/base-machine/manual/install/backup
index 14ebbf30..c31a8f4c 100755
--- a/seed/base-machine/manual/install/backup
+++ b/seed/base-machine/manual/install/backup
@@ -32,7 +32,7 @@ for machine in $MACHINES; do
     done
     BACKUP_FILE="$BACKUP_DIR/backup_$machine.tar.bz2"
     rm -f "$BACKUP_FILE"
-    tar -cvjf $BACKUP_FILE $machine
+    tar -cvJf $BACKUP_FILE $machine
 done
 
 if [ -z "$START" ]; then