backup error in Exchange server

Hi All,

i have facing problem daily after completed the backup of exchange server, and it showing the name of server under the completed successfully and Failed Status. it simply gives the error as.

savegrp: suppressed 2 lines of verbose output
(0xc80001f9)

[7464] 12/21/06 23:14:02 Exchange ESE HResult: -939523591 (0xc80001f9); last error: 0 (0x00000000)

[7464] 12/21/06 23:14:02 HrESEBackupSetup: Backup is already active.


(0xc80001f9)

[7464] 12/21/06 23:14:02 Instance ID: 3218540000

[7464] 12/21/06 23:14:02 Exchange ESE HResult: -939523591 (0xc80001f9); last error: 997 (0x000003e5)

[7464] 12/21/06 23:14:02 Completed backup of Second Storage Group Status: 0xc80001f9

Backup is already active.

[7464] 12/21/06 23:14:07 Backup operation finished with errors. No savetime was sent.

is it backup completed successfully or not and
is there integrity to data ?
yes how can i resolve this error or warning? and where i have to check it out to find out the what & why this error occurs ?
finally how can i take 100 % succeeded backup.
and how can i set alert level to intimate before occur the high level alert or issue.



configuration:

server :hpux 11i.23
client : Exchange Server 2003
mode of backup : SAN

thanks
Siva