Have a look at this.
Due to the use of erasure coding mechanism, only part of data pieces are needed to recover the original file. Therefore, in case there are some storage hosts left the network, you can still recover your file using the rest of data pieces. For the detailed explanation, you can take a look at the video here:
https://www.youtube.com/watch?v=4VERYY-LeUo&t=287sWow, thanks. It's more complicated than I thought and I don't understand all the details, but it sounds pretty good.
At least from what I understood, on a normal rate of storage entering and leaving the network, the files are pretty safe. It's not perfect, but close.. at least according to what they say.
I hope that the time will certify this. For now it sounds good. Good luck!
Awesome one from you. Thanks a bunch.