[jamesbeat]

I'm getting pretty tired of having several different types of book file.

I have a PRS 505 and I'm using calibre, so I'm using the LRF format at the moment.
I'd like to convert all of my books to one format with proper tags and be done with it, but I'm having trouble deciding which one to settle on out of the plethora available.

I'd like to know which is the most 'future proof' of the formats, ie I want to settle on a format that keeps as much information as possible, so if I have to convert to another format at a later date, I won't lose anything in the way of formatting or cover art.

For instance, I've converted a load of PDF's into LRF's. I have sorted through and meticulously tagged them all.
Am I now ok to delete the PDF's, safe in the knowledge that if a new standard comes out, I'll be able to convert my LRF's to it without losing formatting, cover art and meta information?