Technical
From flud
Architecture - explanation of the flŭd architecture
flŭd Protocol - documentation on the protocol flŭd uses to backup and retrieve data. This is a good starting place for information on how to write an independent implementation of the flŭd backup network.
Localized Trust - describes how flŭd's localized trust system works. Each flŭd node determines and maintains trust for other nodes locally.
Fairness - how flŭd ensures that each node provides resources in proportion to those it consumes
Story of a File gives a high-level overview of how a file is backed-up in the flŭd network, how it is verified, and how it is retrieved.
Background Reference
Related Papers with notes and bibtex references
Similar Systems and comparisons to flud's design