ISSN 2009-2237
Digital photography archiving guidelines from the US Library of Congress. The guidelines include advice such as
• Use TIFF or PSD as working file formats.
• Use JPEG or TIFF as delivery file formats.
• Use TIFF or PSD as file formats to archive rendered master files.
• Use DNG to archive raw file data.
Their guidance on backup is also good. There is a two page quick guide but the whole site is worth a read.