Can't retrieve sent email

I recently did a system restore and backed up my computer thumbdrive. All of my inbox was restored but not my folders or sent emails. Is there a way to retrieve them?

Did you backup eMC, using the eMC Backup, prior to doing your “restore”?

yes, I did. don’t know how to find it or use it

If you did not change the default backup location in your original eMC setup check Settings > General > Backup.