A backup task of System Center Configuration Manager 2007 may not work correctly if the backup destination folder contains a special character or the folder name ends with “\”. For example, these folder names will cause an issue:
D:\ D:\Back*up D:\Backup\
This is a known issue in System Center Configuration Manager 2007.
To work around this issue, remove the invalid characters from backup destination folder name. It is recommended to create a destination folder for use only by Configuration Manager because files in the destination folder will be deleted before the backup task runs.