Symantec Backup Exec 10d takes too much time for backup

Hi,

I am using symantec backup exec 10d to take backup of my 6 windows based and 1 linux based server.

Symantec is taking too much time to take weekly full backup.

I dont know what is the issue and I really dont know how to tackle with this because I am very new to Symantec Backup Exec.

From last 40 its taking full backup (70GB) and still its showing backup process is running and out of 70 GB data only 20 GB data backed up, remaining is in process.

Please help me to sort out this issue.