Backup a farm by using SharePoint 2013 Central Administration and the Error Solu

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Use Central Administration to back up a farm
Notes:
Before you backup the farm you should create a shared folder,The Central Admin backups can run as two different accounts, so you have to make sure theyboth have access to \\ap01\IT\web-backups2\spbrtoc.xml. The first account is the account that the Central Admin app pool is running as. The second is the account that the SQL service is running as. If they both don't have modify permissions backups and recoverieswill fail.
To active the SharePoint 2013 Administrate Server

Resolution: Start the administration service

• Start the SharePoint Foundation Administration service by using the Services Microsoft Management Console (MMC) snap-in in Windows. ClickStart, clickRun and type the following:
  
• 　　services.msc
  

Resolution: Check the service account

• 　　If the service fails to start, ensure that the user name and account have membership in the Administrators group on the local computer.
  

Resolution: Repair the configuration

• 　　If the service could not be started, try to repair the SharePoint Foundation configuration on that server by running the SharePoint Products and Technologies Configuration Wizard.
  

To create a shared folder

• 　　Verify that the user account that is performing this procedure is a member of the Administrators group on the computer on which you want to create the shared folder.
  
• 　　If you create the shared folder on a computer other than the one running SQL Server, ensure that the service account for SQL Server (MSSQLSERVER) is using a domain user account and that it has Full Control permissions on the shared folder.
  
• 　　On the server on which you want to store the backup data, create a shared folder.
  
• 　　On the Sharing tab of the Properties dialog box, clickShare, and then in theFile Sharing dialog box, add the following accounts and assign them the Co-Owner role:
  
  
  
  • 　　SQL Server service account (MSSQLSERVER)
    
  • 　　The SharePoint Central Administration application pool identity account
    
  • 　　The SharePoint 2010 Timer service account: Network Service (if you are using SharePoint Foundation 2010 to perform backups)
    
  
  

To back up a farm by using Central Administration

• 　　To perform this procedure, you must be a member of the Farm Administrators group on the computer that is running Central Administration.
  
• 　　In Central Administration, on the Home page, in the Backup and Restore section, clickPerform a backup.
  
• 　　On the Perform a Backup — Step 1 of 2: Select Component to Back Up page, select the farm from the list of components, and then clickNext.
  
• 　　On the Start Backup — Step 2 of 2: Select Backup Options page, in the Backup Type section, select either Full or Differential.
  Note:　　If you are backing up the farm for the first time, you must use the Full option. You must perform a full backup before you can perform a differential backup.
  
  
• 　　In the Back Up Only Configuration Settings section, click Back up content and configuration settings.
  
• 　　In the Backup File Location section, type the UNC path of the backup folder, and then clickStart Backup.
  
• 　　You can view the general status of all backup jobs at the top of the Backup and Restore Status page in theReadiness section. You can view the status for the current backup job in the lower part of the page in theBackup section.The status page updates every 30 seconds automatically. You can manually update the status details by clickingRefresh. Backup and recovery are Timer service jobs. Therefore, it may take several seconds for the backup to start.
  　　If you receive any errors, you can review them in the Failure Message column of the Backup and Restore Job Status page. You can also find more details in the Spbackup.log file at the UNC path that you specified in step 6.
  

　　Note:Perhaps you could have the ERROR:""The backup/restore job failed because there is already another job scheduled. Delete the timer job from the Timer Job Definitions page, and then restart the backup/restore job." Then youshould into the Server Manage and restart the SharePoint Timer Service. that will be OK.
　　http://technet.microsoft.com/zh-cn/library/ff607788.aspx
　　http://technet.microsoft.com/en-us/library/ee748650.aspx
　　Hope to help you...