Open Power shell and run below command, it will give error, if you don't added Microsoft.Sharepoint name space.
Now open Sharepoint 2010 Management powershell and run below commands.
Get-Help BackUp-SPFarm
Get-Help BackUp-SPFarm -Examples
You will get all backup commands..
Use below command to SPFarm backup
Backup-SPFarm -Directory D:\testt -BackupMethod full
So we can do back up using above command...but every week we can't run this command, we have to automate this..
So i am going to write a PS1 script
1.Open Notepad
add-pssnapin Microsoft.SharePoint.powershell
Backup-SPFarm -Directory D:\testt -BackupMethod full
2.Save Notepade with name as: spfarmbackup.ps1
3.Go to start-->search for Task Scheduler
4.You will get window
5.In the roght side Under Actions-->Click on Create Basic Task
6.You will get a window, enter name of the task: ex: Weekly SharePointFarm Backup
7.Click Next
8.In the Trigger-->Select Weekly-->Click Next
9.Select Day name
10.Actions: Start a program
11.Browse the PS1 file which we have created-->Click next
12. Check "Open the properties dialog for this task when i click finish"
13.U will get a prompt
14.Select Run whether user is logged on or not
15. Enter password
16.Click ok
17.Click on Task Scheduler Library, you can find u r task
18.Login to Central Admin
19.Click on Backup and restore
20 CLick on "View backup and restore history"
21. You can view Backup jobs...