JoeyP - 2018-11-05

I use cascading encryption AES-Twofish-Serpent. I do not use any hidden volume. I have a 50 GB container on my computer where I have all my sensitive files that I work on daily. I backup by copying the container to an external drive.

I've just read the warning in the documentation where if you copy one container and use the other copy so they contain different data, it is possible to aid cryptanalysis thus weakening your security.

Is my method of backup really insecure if an adversary acquires both copies of the container? Is there some level of over paranoia about cryptanalysis or will my use of cascading encryption protect me?

I understand the warning about creating a different container with different headers and then everytime you want to backup copying the files from container to container, but the problem is this inherently changes the metadata on the files when you copy them, and another reason I use the containers is to ensure data integrity so that all the data remains the same.