SQL Server Alias for Directories

I have different folders on different machines and I need one logical name (alias) for them both, sure one on each server. I need to create one logical directory in several servers with the same name, but their paths in actuality are different. So I can create a logical backup device with a path, which is like this c:/myfolder/backup.bak and all the backups initiated to this device will be appended in the same file. But I need to create it for the c:/myfolder directory (aka folder) without specifying the file backup.bak. so it will reference to a folder and not to a file, so I can create different backups in the folder with different names and separate files.