Only drpms are enough for updating?

view full story

http://forums.fedoraforum.org – My office PC is offline, so I download updates/12/x86_64/{drpms,repodata} from fedora reposiroty to my home PC then copying them to my office PC's ftp server. Then I use yum to update from my own repository server. But I found the drpms are not enough to perform a complete updating. Some *.rpm pakage are still need download. My question is: How do I know which package should be complete downloaded from rpm and which package download the drpm is enough? (HowTos)