This guide will let you know how to get Salvaged Data in No Man’s Sky. You have to follow all the instructions in this guide to get it.
The first way you can get salvaged data is by just going around on any planet and using your analysis visor to look for buried technology modules that will give you salvaged data when you dig them up and open them.
The next way you can get salvaged data is to buy them from the minor settlements or traders. You can find them by using the inhabited outpost planetary chart, which you can get from the cartographer on the space station using the navigation data.
If you want, you can save near the settlement and buy the data, then save and reload your game as the store should refresh. If you plan to buy the salvaged data, you will need a good amount of credits to keep buying them.