Everyone that uses chats for serious business. I can't afford to loose conversations with my clients. For that I use only messaging systems that allow me to sav

Everyone that uses chats for serious business. I can't afford to loose conversations with my clients. For that I use only messaging systems that allow me to save chats: email, and then WhatsApp. Even Telegram has a problem, because even if messages are on the cloud, one could delete single messages or a whole conversation on your device as well. Regarding screenshots and saving messages: not only it's a thing that you have to remember doing, but screenshots have (at least in my country) no legal value, since everyone can easily produce them with Photoshop. You can say the same thing for WhatsApp messages, but sure it's more difficult (or at least it appears more difficult to a judge that doesn't know anything about IT). Basically screenshots are never accepted as a proof for something, WhatsApp messages on your phone are.