Start the NetBackup Administration Console.  (see relevant doc)

In the menu tree on the left-hand side of the NetBackup Administration
Console, click Policies.

The Policies window will appear.  The left-side window is the list of 
all policies.  The right-side window contains the general details of
the currently highlighted policy.

To create a new policy, right-click inside the left-side Policies
window, then select New from the pop-up menu.  The Add a New Policy
window will appear.

Enter the name of the new policy, then click Ok.  The Change Policy
window will appear, with the Attributes tab showing.

Set the Policy type by selecting one of the option in the drop down
menue in the upper-left-hand side.  For a Unix client, select Standard.
For a Windows 2000 or Windows XP client, select MS-Windows-NT.  For a
Microsoft Exchange Server client, select MS-Exchange.  For a Microsoft
SQL Server client, select MS-SQL-Server.

Next, set the Policy storage unit by selecting one of the options in
the appropriate drop down menu.  Unless some sort of special case
comes up, you'll simply want to select Any_available.

Next, set the Policy volume pool by selecting one of the options in
the appropriate drop down menu.  This is the group of tapes in which
you want to store the data.  For example, if you were backing up data
from a Linux client, you would select LinuxFull or LinuxIncr, depending
on whether you wanted to perform full or incremental backups, 
respectively.

If you wish, you may change the Job priority by increasing or decreasing
the number in the Job priority field.  The higher the number, the higher
the priority for the job.

If you wish to make the policy active, click in the Active checkbox,
and set the time and date at which you want to the policy to become
active.  IMPORTANT:  No backups for this policy will occur until the
policy is made active.

Generally speaking, you shouldn't need to check any of the other 
checkboxes in the Attributes tab.

Next, click the Apply button.

Next, click the Schedules tab.  The Schedules tab window will appear.

Enter the name of the schedule in the Name field.  Note that spaces
and special characters may not be used in the name.

Set the type of backup desired by selecting one of the options in the
Type of backup drop down menu.

Set the frequency at which the backup is desired.

Set the Retention (the duration for which you want to retain the data
before discarding it) by selecting one of the options in the Rentention
drop down menu.  (suggestion: one year)

Next, click the Start Window tab.  The Start Window tab window will
appear.  Using the drop down menus, set the day and time at which a
backup may begin.  Then set the time period during which a backup may
begin during that day by entering the time period in the Duration
fields.  If you wish to add another day during which a backup may 
occur, go back to the Modify day drop down menu, select a new day and
start time, and a new duration.

If you wish, you may also choose specific dates when you do not want
backups to occur.  To do this, click on the Exclude Dates tab, and
click on the dates in the calendar which you want to exclude from the
backup schedule.

When you are finished creating the schedule for this policy, click the
Add option.  You will be sent to an unfilled Add Schedule window.
You may create another schedule if you wish.  If you do not wish to
do so, click the Close button.  You will be sent back to the Change
Policy window.

Click the Files tab.  The Files tab window will appear.  Click the New
button.  The Add File window will appear.

Set the pathname of the directory you wish to back up by selecting one
of the options in the Pathname or directive drop down menu, and click
the Add button to the right.  Alternately, you may specify the
directory you wish to back up by typing it in the field and clicking
the Add button to the right.  IF you wish to back up all local drives
on the client, just select ALL_LOCAL_DRIVES.  (windows vs. unix?)

When you are done selecting the files and directories you wish to back
up, click on the Clients tab.  The Clients tab window will appear.

Click the New button.  The Add Client window will appear.

Enter the name of the client in the Client name field.

Set the hardware and operating system of the client by selecting one of
the options in the Hardware and operating system drop down menu, then
click the Add button.

You may continue to add clients the same way.  When you are done, click
the Close button and the policy creation will be complete.

To modify an existing policy, click the desired policy in the left-hand
side Policies window to select the policy, then right-click on that
policy and select Change from the pop-up menu.  The Change Policy window
will appear.  Be sure to click the Apply button after making changes in
the Attributes tab to make sure that those changes are applied.