...
- Common-X.nmis
Common-database commonly has local adjustments if you want different RRD data retaining periods, or if you use a non-standard RRD directory schema, or if you have custom models with extra RRD databases.
Common-thresholds is another likely candidate for local changes. Most of the other Common-X files rarely require local adjustments, unless you are customizing your models. - Model.nmis
This file controls the model autodetection. If you haven't created custom models and added them to the model autodetection, then this file will not contain local changes. - Model-Y.nmis
These files constitute the modelling configuration for all device types that NMIS knows about. Local changes would be present if you extended or adjusted existing models in-place. - Graph-Z.nmis
These files contain the graph definitions for NMIS's graphs. Local modifications are possible but not especially likely.
...