Thanks @adele157 !
I have also just found @Aidan’s post at Running Model Experiments with payu and git which covers similar material. However, this is again using a different method. Specifically, there he links to the payu docs and the line payu checkout -b perturb --restart path/to/restart to restart from a specific restart, whereas the github tutorial recommends linking/copying the output/restart into your archive directly as I’ve always done. Both will work, but it would probably better to be consistent across the various tutorials.