Pleskbackup (9.2.3) fails with

[MaximillianU]

Using plesk 9.2.3 (w/o possibility to upgrade which is one of the reasons for the backup)
on debian 64amd, lenny (due to reinstallation)

using

/opt/psa/bin/pleskbackup domains-name -vvz --output-file=/backup/target.bak

I get the error

ERROR The pmmcli STDERR:'the name `ate' is not a tty'
the name `ate' is not a tty
the name `ate' is not a tty
-------------- Start print backup log hire --------------
the name `ate' is not a tty
<?xml version="1.0" encoding="UTF-8"?>
<response>
<errcode>0</errcode>
<data>
<task-log>07:00:03 INFO ------------------------------------------------------------
07:00:03 INFO Migration status reporting initialized.
07:00:03 INFO Status file: /opt/psa/PMM/sessions/2010-11-21-080003.434/dump-status.xml
07:00:03 INFO ------------------------------------------------------------
</task-log>
</data>
</response>
-------------- End print backup log hire --------------

You can view additional information in the log file located in /opt/psa/PMM/sessions/2010-11-21-080003.434/migration.result directory. This directory will be removed automatically after 30 days

Runtime error: The backup failed with errors!

I looked around tryed some other servers with Plesk 9.5.2 and got the same message.
Looks to me like a problem of basic linux package installation below or - any other ideas ?