Regarding Subfolder

I would like to copy daily backup files from different folders to new location. The folder structure looks like this:

C:ackup database1database1_db_20071114.bak
database2database2_db_20071114.bak
msdbmsdb_db_20071114.bak
....

But I do not want to copy the backup file from some system database folders, say MSDB, so I have to choose some user database folders. What should I do? How can I extract the subfolder name from variable?

Any suggestion would be appreciated.