diff --git a/install/sql/incremental/upd_0062.sql b/install/sql/incremental/upd_0062.sql
index d68d2bfdcd6f4be4d095b2d87152d1038eff5b73..cee5ff93cc3b28873f8e7ac83b9f68de8314cd58 100644
--- a/install/sql/incremental/upd_0062.sql
+++ b/install/sql/incremental/upd_0062.sql
@@ -10,5 +10,5 @@ CREATE TABLE `mail_backup` (
   PRIMARY KEY (`backup_id`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
-ALTER TABLE `mail_user` ADD `backup_interval` VARCHAR( 255 ) NOT NULL ;
+ALTER TABLE `mail_user` ADD `backup_interval` VARCHAR( 255 ) NOT NULL DEFAULT 'none';
 ALTER TABLE `mail_user` ADD `backup_copies` INT NOT NULL DEFAULT '1';
diff --git a/install/sql/ispconfig3.sql b/install/sql/ispconfig3.sql
index 009daa7fe6cdecc733eb69aaf8866779541abbc7..47fad5da27c63b793e0a4f85083f2a844a5c0c29 100644
--- a/install/sql/ispconfig3.sql
+++ b/install/sql/ispconfig3.sql
@@ -918,7 +918,7 @@ CREATE TABLE `mail_user` (
   `disablelmtp` enum('n','y') NOT NULL default 'n',
   `disabledoveadm` enum('n','y') NOT NULL default 'n',
   `last_quota_notification` date NULL default NULL,
-  `backup_interval` VARCHAR( 255 ) NOT NULL,
+  `backup_interval` VARCHAR( 255 ) NOT NULL default 'none',
   `backup_copies` INT NOT NULL DEFAULT '1',
   PRIMARY KEY  (`mailuser_id`),
   KEY `server_id` (`server_id`,`email`),