If a Bitcoin user can get a transaction into the block chain it is effectively permanent. Ombuds is based off of this principle. Any software that understands Ombuds' messaging format and has a copy of the block chain can then decode these bulletins and display them for the public to view.
To censor a user's bulletins, an attacker must either block access to Bitcoin completely or generate blocks faster than the entire honest network. Since most small nations do not have the hashing infrastructure to mount a 51% attack against the Bitcoin network, Ombuds's method for storing bulletins is robust.
This system does not depend on the honesty or availability of any single website, service or hard drive. Instead, Ombuds relies on the global distribution of the block chain to ensure the availability of its public record.