May I suggest you keep your core Poser run-time 'sparse', use the external library facility to link in whatever unique stuff you need for a specific project ??

Link to folders *holding* those external runtime, lest Poser be utterly confuddled. To sanitise really classic stuff, I load empty runtime folder tree into new 'holding' folder, move whatever where...

Also simplifies porting / organising 'other' mesh / model formats, as easy to keep Zip/Rar, thumbnails / comments / scaling info / renders etc together...

I've 3~~5 TB of 'stuff', spread across three data-drives. Ranges from low-poly, static, clad-mannequin 3DS figures, mostly 'Medieval-ish', from my 'Classic FloorPlan' days via a zoo of rDNA etc freebies for P3+P4, many XPS etc figures ported via FBX, sundry XPS and PMX props / stages / scenes exported to OBJ+MTL, to the latest 'Salt Lake' freebies...

May your back-ups be current...