hmmmm....
that doesn't work. I tried it with and without option r (for recursive which apparently it doesn't have <how are you supposed to do directories?>).... I know! Tar with no compression piped to lzma!
Whatever! I'm just going to use tar with option 'J'!
oops.... missed the source file!
lzma -z -<compression level> /dev/sda1 /dev/sda3<filename>