Failed Backup - What to do?

Might need help with failed backup… Error message said -

System.UnauthorizedAccessException: Access to the path is denied.
at System.IO.FileSystem.MoveFile(String sourceFullPath, String destFullPath, Boolean overwrite)
at System.IO.File.Move(String sourceFileName, String destFileName, Boolean overwrite)
at System.IO.File.Move(String sourceFileName, String destFileName)
at MailClient.Storage.Backup.BackupCompressionTool.Finish()
at MailClient.DbBackup.FormBackup.Backup(CancellationToken cancellationToken)
at MailClient.DbBackup.FormBackup.<>c__DisplayClass28_0.<MainForm_Load>b__0(Object a, DoWorkEventArgs b)
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)

Access to the path is denied

Have you changed the default backup location ?