A backer survey is a questionnaire given to people who have supported a project or campaign financially, asking for their preferences or information so that the project can be completed according to their needs or wishes. Full definition
It allows you to turn backer survey responses into data that can be used for manufacturing and fulfillment. (floship.com)
We've known for a couple weeks that Hover: Revolt of Gamers was making the jump to Switch, but according to an official backer survey, it looks like the Wii U version is still an option. (gonintendo.com)
The vast majority of console backer surveys are unlocked — but in some cases there's a technical reason why the survey couldn't be unlocked; you can spot this by looking for the «Edit Pledge Questions» button (see above image)-- if you can not see that button, it means your survey is still locked. (playtonicgames.com)