Backed pieces, although already present in earlier periods, became widespread in the Upper Pleistocene and Holocene, and are part of the classic definitions for the Later Stone Age. However, the association of backed pieces with Later Stone Age appears less clear in the Horn of Africa than in other regions. These pieces are present in both Middle Stone Age and Later Stone Age contexts, and the homogeneity of the "backing phenomenon" in the Horn of Africa can be questioned. Here, we first critically review the literature on backed pieces in the Horn of Africa and, given the lack of terminological consensus and the absence of a shared typology in the region, we describe the variability of backed pieces using two complementary approaches: multivariate statistical analysis on a set of 28 attributes of 188 artefacts coming from 8 securely dated contexts, and 2D geometric morphometrics analyses on the same dataset. The two approaches provided complementary results which allowed us to identify and discuss chronological trends (e.g., the apparent absence of miniaturization across different temporal intervals, the increase in the number of geometric shapes during the Middle and Late Holocene) without either resorting to new terminology or proposing a new formal "descriptive" typology.