How to re-use encrypted volume

[user1]

>> So how am I supposed to re-use an existing encrypted volume?
>> 
>> Any hints?
> 
> No hints?

I would copy the decrypted content onto an external harddisk, probably 
first save it all into a tar.gz file to do it faster.

Then I would create a new encrypted data partition, and then restore 
above contents onto that.

There might be better ways to do it?

Hope this might give you an idea, as I have never tried it.