Localsystem account access deny

Hi All,

I have a SQL server, as I use a domain account to log on to SQL server and Sql server agent, all maintanence plans work good, since I changed from a domain into Localsystem account to log on to SQL server, and Sql server agent, all maintanence plans didn't work any more, then I tried only keep Localsystem account at SQl server , using a domain log on to Sql server agent, but it's still failed to maintanence plans. The error in job history is"Executed as user: candyl. sqlmaint.exe failed. [SQLSTATE 42000] (Error 22029). The step failed.". And the message at Sql server log is :"BackupDiskFile::CreateMedia: Backup device 'D:\Database Backups\Noon Backup\ESMDEV_db_200406141548.BAK' failed to create. Operating system error = 5(Access is denied.)". It looks like permission problem, but for Localsystem account which should has full permission, right? I tried may ways and searched from knowledge base , still couldn't find the related solution.
Anyone can give me some advices?

Thanks.Help please!!!!!|||Does the user candyl have NT permission to create files in the destination directory?|||If users have been set up permission at server box, they can create the directiory.|||1. Does the user 'candyl' has the admin rights on the SQL Server?
2. Try this: 1) log on to your server under the 'candyl' login abd try to create any (dummy) file under the 'D:\Database Backups\Noon Backup\' directory. Was it successful?