Can't get old emails

I recently reinstalled Windows after building a new PC, and had to reinstall eM Client, but I’m now having trouble getting my old emails back.

I backed my whole PC up before the Windows reinstall, but I didn’t specifically back up my emails through the client, so it’s not in an obvious place like my documents folder. I’ve already turned on weekly backups so I won’t have to deal with this next time I reinstall Windows.

I’ve had to do this before, so I know it’s possible, but I can’t remember which of the local subfolders is supposed to have my old emails in it. Just copying the contents of the old local folder over the current one didn’t work. The last time I did this, I used an article or a forum post for instructions, but I didn’t save it, and after searching for it online, I’m not turning up anything useful.

Thanks in advance for any help.

EDIT: Old version number is 7.2.34711.0 Current version is 8.1.1054.0