Backup Database stored procedure

CREATE PROCEDURE [dbo].[BackupDatabase]
    @dbname VARCHAR(50)
AS
BEGIN
    SET NOCOUNT ON;
    if  (EXISTS (SELECT name FROM master.dbo.sysdatabases WHERE ('[' + name + ']' = @dbname OR name = @dbname)))
        Begin
            DECLARE @path VARCHAR(256);
            DECLARE @fileName VARCHAR(256);
            Declare @currentDate varchar(50);
            SET @path = 'D:\Backup\SqlServer\';
            set @currentDate=REPLACE(REPLACE(REPLACE(CONVERT(CHAR(16),CURRENT_TIMESTAMP, 120), '-', ''), ' ', ''), ':', '');
            SET @fileName = @path + @dbname + '_' + @currentDate + '.BAK';
            Print 'Backup fileName ' + @fileName;
            BACKUP DATABASE @dbname TO DISK = @fileName;
        end
    else
        PRINT 'database ' + @dbname + ' not found';
END