This article explains how to record a call with Google Voice, how to retrieve recorded calls from Google's servers, and privacy concerns.
You can record your calls on your computer, smartphone, or any portable device. Google Voice can ring several phones upon receiving a call, so the option is open on all devices. Since the recording mechanism is server-based, there isn't anything more you need in terms of hardware or software.
Google doesn't enable call recording by default to prevent people who use touchscreen devices from accidentally recording a call without realizing it. (Yes, it's that simple). For this reason, you need to enable call recording before you can use it.
Access any recorded call by logging in to your account. Select the Recorded menu item to display a list of your recorded calls. Each call is identified with a timestamp and the duration of the recording. Play it right there or choose to email it to someone, download it to your computer or device, or embed it within a page. The menu button in the upper-right corner lists all these options.
While all this is easy and convenient, it poses a serious privacy problem.
When you call someone on their Google Voice number, they can record your conversation without you knowing it. The recording is stored on Google's server and can be spread to other places. The risk is enough to make some callers apprehensive about making calls to Google Voice numbers.
If you're concerned, make sure you can trust the people you're calling or be mindful of what you say. You may also want to look up a number to know whether you're ringing a Google Voice account. This isn't easy because many people port their numbers.
If you're considering recording a phone call, inform the other party of this before the call and get their consent. In many countries and some U.S. states, it's illegal to record private conversations without the prior consent of all parties concerned.
Source: https://www.lifewire.com/how-to-record-call-with-google-voice-3426756