tar
não é compactado por padrão, apenas não adicione uma opção de compactação:
tar cvf myfolder.tar myfolder
Estou incluindo comentário do Hennes na minha resposta, pois adiciona informações úteis:
TAR (tape archive) is originally a unix program used to create archives on tape. Since all devices are treated as files under unix it is easy not to write to a tape but to a file instead. This is usually done with the -f flag. The command tar cvf myfolder.tar myfolder means tar, create, verbose file filename_to_create what_to_tar. There is no compression in this anywhere. Tar archives (as files) where often compressed using the compress program and gained the extention .Z (e.g. file.tar.Z). Later on this got included in gtar with the z flag