Use the Analysis Visor to scan for buried technology modules
Dig up buried technology modules with the Terrain Manipulator
Open salvaged data modules to collect Salvaged Data
Search for buried technology on planets with high-density terrain
Use Exocraft scanners to locate buried technology faster
Buy charts from Cartographers at space stations for distress/buried tech signals
Complete Nexus missions that reward Salvaged Data
Loot damaged machinery and buried containers when available
Trade with NPCs if they offer Salvaged Data
Farm planets with many buried technology markers for repeated collection