There are three places where the instructions recommend 'chmod 0766'.  This is
an incorrect setting for a Linux directory - a better choice would be 'chmod
0775' or 'chmod 0777'.

Suggested patch:

@@ -55,8 +55,8 @@
     $lang['install_abort'] = 'INSTALLATION ABORTED';
$lang['make_corrections'] = 'Please make the necessary corrections before
trying install again.';
$lang['Tar_missing'] = 'You cannot use this module, since you don\'t have
tar command installed on your server.';
-    $lang['cannot_create_folder'] = 'Cannot create admin/backups folder. Make
sure the admin folder has write and read permisions granted (chmod 0766).';
-    $lang['cannot_create_verbose'] = 'The module cannot write data in his own
folder. Please grant write permission (chmod 0766) in modules/FileBackup
folder.';
+    $lang['cannot_create_folder'] = 'Cannot create admin/backups folder. Make
sure the admin folder has write and read permisions granted (chmod 0775).';
+    $lang['cannot_create_verbose'] = 'The module cannot write data in his own
folder. Please grant write permission (chmod 0775) in modules/FileBackup
folder.';
      
     //DODUMP
     $lang['DUMP_Please_wait'] = 'Please wait until task is fully completed';
@@ -65,7 +65,7 @@
     $lang['DUMP_Task_started'] = 'Task started';
$lang['DUMP_Executing'] =
'<p><b>Executing...</b></p><p><code>%s</code></p>';
     $lang['DUMP_Task_completed'] = 'Task completed';
-    $lang['DUMP_not_readable'] = 'WARNING : cannot find/read the output file
(%s). Grant read/write permission (chmod 0766) in module\'s folder';
+    $lang['DUMP_not_readable'] = 'WARNING : cannot find/read the output file
(%s). Grant read/write permission (chmod 0775) in module\'s folder';
$lang['DUMP_not_writable'] = 'ERROR : %s CANNOT BE WRITTEN to backup
folder';
     $lang['DUMP_error_tables'] = 'Error fetching table names';
     $lang['DUMP_prefix'] = 'ALL';