No one really knows the tip for this except perhaps Google employees. I've asked a lot of web marketing experts and Mineral Insulated Cable everybody has theories but so far we do not have concrete answers. Most people report that Google backlinks often a involving the least relevant (low PageRank) backlinks or a miss-mash selection of random oneway links. I initially thought perhaps only what Google deemed as authority site backlinks could well be listed but so far this recently been disproved because plenty of obviously non-authority sites exhibit in link building.
So subject to the current know factors, what's the best backlinking strategy? Pay attention to all of the know factors and produce backlinks that adhere to the basics.