Supported face seal assemblies and related methods are disclosed. The supported face seal assemblies (156) have spring energized seal element (108) supported by a backing ring (132). When the two components are joined, they form an interlocking face seal assembly (156) that is less prone to separate during installation and/or service. The methods disclosed include the steps of forming a spring energized sealing element (108) with a convex outer surface (150), forming a backup or support ring (132) with a concave inner surface (146), assembling the sealing element into the inner bore of the backup or support ring such that the concave inner surface accepts a portion of the convex outer surface and the sealing element (108) is retained within the backup or support ring (132).