[mitch13]

Hi,
My very large calibre library consisting of 11 sub-libraries has been running for a very long time. Now it is corrupted twice within a couple of days. The first time I used the rebuild option which finished OK. Later that day I ran the database check and after the first run it was great. The second run (authors/Title etc also ran OK with a few books to correct - nothing major.
Just an hour ago as I tried to load Calibre the attached message came up offering to rebuild the library but could strike problems or to create a new blank library (by this I assume that the 'corrupt' library is left in place).
At this stage I do not know which option to take. The rebuild may work but take forever before finding out and the second option I do not really want as I have a very large number of books in my library accumulated over many many years.
Any suggestions how I can recover my library. I usually back up my library regularly but Murphy's Law tells me I have not done this for a couple of weeks! I am current backing up what I have library by library.

mitch13