  We uncover a novel and robust phenomenon that causes the gradual
self-replication of spatiotemporal Kerr cavity patterns in cylindrical
microresonators. These patterns are inherently synchronised multi-frequency
combs. Under proper conditions, the axially-localized nature of the patterns
leads to a fundamental drift instability that induces transitions amongst
patterns with a different number of rows. Self-replications, thus, result in
the stepwise addition or removal of individual combs along the cylinder's axis.
Transitions occur in a fully reversible and, consequently, deterministic way.
The phenomenon puts forward a novel paradigm for Kerr frequency comb formation
and reveals important insights into the physics of multi-dimensional nonlinear
patterns.
