Help me in taking backup on linux machine (very very Urgent)

[Guest_imported]

Hai,

I am having a linux server and a sun solaris ultra10 machine
I connected a dat drive to the linux server for taking backup.
I want to take remote back up from sun solaris machine to linux tape drive. through nfs I shared the /dev/st0 ( tape device ) to the sun solaris machine But when I am using ufsdump on solaris machine I am giving the following command on the solaris machine.
ufsdump -0f hostname:/dev/st0 /etc
it is giving the following errors

DUMP: permission denied
DUMP: cannot connect to tape host (hostname)
DUMP: The entire dump is aborted


Please give me inputs on this. Please help me in this matter as early as possible. It is very very urgent