Truecrypt Rsync Container


Is there a good way to incrementally sync truecrypt containers? I currently have large containers (200gb+), and I'd like to find a way to back them up without having to mount them. Rsync seems to not be able to sync incrementally and instead tries to re-transfer the whole container each time even when only a single file inside the container changed.

Is there some rsync patch or some specific option to make rsync look harder for differences instead of transferring the whole file? Or, is there some better tool to do this?

Best Answer

Unfortunately, due to the nature of stream encryption, it is not possible to incrementally back up an encrypted volume. This is because the entirety of the volume is cryptographically dependent on each individual part. This is for security reasons. You will need to either decrypt the container, or copy the container entirely each time.