So, my first thought on any note taking product is: So, how do I know that my work won't be lost after getting a ton of stuff into it? I see nothing about back

So, my first thought on any note taking product is: So, how do I know that my work won't be lost after getting a ton of stuff into it? I see nothing about backup, ie. iCloud or anything else. My second thought is: When this product dies, how do I get my data out? As a long time note taker, I need to know those two things to feel safe about investing into it.