>  > Maybe /usr/bin/perl is suid?

Yes!
Perl is suid:

server:/usr/local/bin # ls -l /usr/bin/perl
-rwsr-xr-x  3 root root 1334016 2007-11-08 18:49 /usr/bin/perl

How permissions I have to set to /usr/bin/perl?
On another server I have it setted to 755, is it right?

>  > Try the following perl program, run it as user backuppc:

server:/usr/local/bin # su -c test.pl backuppc
Insecure $ENV{PATH} while running setuid at /usr/local/bin/test.pl line 3.

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