Existe um arquivo de configuração que eu possa copiar para um diretório e restaurar feeds antigos?
Os dados do feed são um banco de dados SQLite, armazenado na pasta de cache do FeedDemon:
%LOCALAPPDATA%\FeedDemon\v1
O arquivo é chamado feeds.fdb .
Como faço para reparar um banco de dados corrompido do FeedDemon?
FeedDemon stores its data using SQLite, which is regarded as being very reliable even in situations that would cause other programs to corrupt their data (such as a sudden power failure). However, in very rare cases FeedDemon's database may become corrupt.
...
To repair the database, first open FeedDemon's cache folder, which contains your feed data. If you haven't changed the location of the cache folder, you can find it by opening Windows Explorer and typing this into the address bar:
%LOCALAPPDATA%\FeedDemon\v1
Fonte FAQ do FeedDemon