A directoy /Folder has two subfolders in it called TEST and test.
Both the above mentioned folder names are same but they are different for the operating system due to the case they are created in. Backing up /Folder directory will work fine but restore of files from the same name folder will not work.
A hotfix is now available for this issue in the current version(s) of the product(s) mentioned in this article. Refer to the Hotfix link under Related Documents at the end of this article to obtain the hotfix needed to resolve the issue.
Backup Exec 2012 Rev 1798 Service Pack 2 (TECH203155)
This issue can occur with backup sets of Operating System that allow two same name folders to be created at the same directory level.