This I think is the most important fact about our entire network. We need to solve this problem.

So, open question: What do you need from Sia in order for you to start using it to store files?

This isn't about hypothetical other people or businesses, but directly about the person reading this post. What is missing from Sia today that is preventing you from wanting to back up your storage.

I can think of two things for me:

1. I'm nervous about spending money on siacoins to back up my data. But I'm going to bite the bullet and allocate 1 million siacoins towards backing up my data.
2. There are no spending limits in the renter yet. When I upload a file, there's still that question of 'what if it screws up?'. This can be solved in 0.4.2 by adding spending limits.
3. Files have to be uploaded 1 by 1. I would rather have some other way to upload files than 1 at a time, especially since my primary use case is backing things up. I think we can also fix this in 0.4.2

and, though this is a lesser deal for me

4. It's annoying to use sunfish right now because I can't upload ascii files. I think that this is already fixed in master  though.