Need Help - local folder recovery

It was a while back but when I did the upgrade to 9.2 eM Client crashed. I tried recovery and it failed. I was able to reinstall and it pulled the active emails but what I lost were all of my local file structure and saved files.

When I go to USER-APPDATA-ROAMING-EM CLIENT-LOCAL FOLDERS; location on the PC, I have all kinds of dat.bak files… (attachments, contact_data, index, event, folders etc…) and the mail_data,dat.bak and mail_fti.dat.bak, mail_index.dat.bak. All the same date, from before the crash.

Mind you it’s been months since the crash but I really need to recover some of those older saved emails. What is the best way?