Where can I locate my old Zotero files

I upgraded my Zotero to version 7. Before that, I backed up my files, hoping to import them to the new version. After the upgrade, I could not import the backed-up files because they were not saved in bib texe format. I have a lot of files in the old version, and I no longer use my old email. How can I get my old files back, please?
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