Although unreleased at this point, I have updated my apps to do one of two things moving forward:
If you are using a device with file support (currently only desktop), you will have an export to file and import file options now. This is essentially a traditional backup/restore method.
If file support isn’t detected, a new import option has been added allowing a paste of the export email.
In addition to either of these methods, the previous method of using the app’s storage still exists and works.
Hopefully this will help the process!