Library damaged

Hello,

I have a very important library, full of videos, projects that are key to me. I opened it today (first time in months) and I'm greeted by a "The library appears to be damaged and won't be backed up" message. 
I rushed to back ups...but there is nothing there (maybe because it has been few months since I've lasted opened that library).
What should I do while I can still access the library? Should I copy all my projects in a new library and relink assets? But won't the issue be copied as well?Library is on a reliable (I think?) external SSD (SanDisk Extreme Portable SSD) formatted in APFS.
Thank you for your help.

The library is nothing but a holder of XMLs and assets, if that's where you tend to store them. (I don't)

It's good it can still be read (but not backed up) so what I'd do is export all the XMLs and then reimport into a new library. The trick here is that as long as you have the XML everything can be recreated. If the library craters completely to the point where it won't even open one can always do a 'Show Package Contents' on it and retrieve all the imported assets manually. Relinking all will likely be required, not so if the 'leave files in place' was selected on import.

On closing FCP I always export library XMLs tagged with date and time (030422-0944) exported because, well, you just never know. It's easy for me since I create a separate library per job simply to avoid these 'all video eggs in one basket' pending catastrophes.