An add-on with a single code base that supports five different CMSs? That’s the unicorn of platform-agnostic add-on dev, and it is just as illusive. Special guest Eric Lamb shares how he developed an efficient, smart approach to porting his popular ExpressionEngine add-on, Backup Pro, to four other content management systems (with more planned). The key? Abstraction. He also details the nuances of working with different communities and submitting add-ons to different marketplaces, as well as the challenges of support and how he keeps it manageable.