[lalebarde]

Originally Posted by Agama

so I deleted all the following files from the calibre library structure: *.pdf, *.txt, *.zip and it worked - no duplicates and calibre works with no error messages.

I will cron a script that replace files by links to their original when they exist.

Originally Posted by Agama

One beneficial side effect of calibre's approach is that you have an automatic backup of your original in the event of an accident.

For me, that's backup of backups.

Originally Posted by Lady Fitzgerald

calibre can be used to recreate a folder/filename structure that will probably be more consistant than your original one.

I really don't like the folder structure of calibre - but I understand this is not important thanks to tags. Nevertheless, I do prefer relying on a folder structure than on tags - just my own opinion and taste.