Is milanote safe?

I am an artist and I need to store a lot of reference images in case I need them later on. In the past year it sort of developed into a second brain of mine. I am a bit anxious that in case of a cyberattack or something similar all of my knowledge gets erased. So is Milanote safe for data storage and is it a good alternative application for a second brain instead of Notion, Remnote etc.?