Hello drew345,
well, may I ask you why do you want to back up your files in an unencrypted format?
It's enough to back up your .bc (encrypted files).
When needed, you restore the file(s), to a Cloud/folder/etc., add this to Boxcryptor as a location any you have access to your file(s).
But, if you still want to back them up in unencrypted form:
1. Get a backup software
2. Set the advanced Boxcryptor settings (explained here: https://www.boxcryptor.com/en/help/settings/windows/#platform-settings).
No need to decrypt/encrypt before doing the backup.
Best,
Yasmin