Database Backup using batch mode doesn't work

Hello,

i try to use the batch mode to backup the HANA DB (1.00.21) but nothing happens.

my backup.sql

\connect -n <server name> -i <instance number> -u <user> -p <password>
//
BACKUP DATA USING FILE ('Monday')
//

excecute the backup

/usr/sap/<SID>/HDB<instance number>/exe/hdbsql -I backup.sql

The instructions work for themselves but with this script nothing happens.

Any ideas?

Thanks