Backup Running very slow in trial version

Hi,

i have installed symantec backupExe 2012. i have scheduled a task to copy one folder from one server to another server.

both server under same network and have normal file copy speed of 34/36Mbps from one server to anohter server but if i use this backup software and copy it in a LTO 3 tape speed becomes 1MB/Minute.

is it because of the trial version or any other issue? attached is the speed of data backup.