Offpage SEO is what many people give it as low priority, just only send the backlink. Said that lot backlink give us high ranking. In the past it can do but not present. You will get ban from Google faster. Backlink should be looked natural in Google eye.
That's why monitoring backlink we need to care for better quality of SEO because if we don't care we may loss it all. And how to monitor?
Thing that we need to control at all, DA or PR from resource of backlink from each IP Class, CMS platform and very important is % of Anchor Text, the link form that suite with our primary and secondary keyword.
SEO should be controlled well...