what does an Electronic Discovery Technician do, exactly...?

Answer 1

It is a person that performs the following:

Electronic discovery ("e-discovery") is the process of requesting, obtaining, and reviewing material that has not been reduced to a tangible medium (such as paper or microfilm) or that co-exists with a tangible copy. Common types of material include e-mail messages, word processing files, spreadsheets, address book information (including data from personal digital assistants ["PDAs"]), Internet use histories, and files downloaded from the Internet. Even for material that has been produced in a tangible form, such as printed memoranda, the electronic version of this material often contains additional information, such as revisions, deleted material, and typist information (so-called document "metadata") that is not visible on the printed version of the document. Sweeps for electronic materials have retrieved unflattering drafts of official documents, e-mail messages inconsistent with official company positions, and even evidence of affirmative wrongdoing, such as spreadsheets used to track money being embezzled from corporate bank accounts. These types of documents provide powerful ammunition for motions or trial.

Answer 2

Obtain electronic information, such as emails, word documents, social media posts, PDF files, spreadsheets, etc. Basically, they seek after such information that can be used in court.