Restoring a KMail folder from a generic backup

[John M Cavallo <johnc0102@xxxxxxxxxxx>]

I am using KMail 4.10.5 on a Linux system and have a regular backup of my 
entire home directory. I was manually cleaning up my KMail folders using 
'Archive Folder...' with the 'Delete folder and subfolders after completion' 
when I accidentally overwrote an archive of another folder. Is there a way of 
restoring the lost mail folder from the backup? 
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