I use Truecrypt with Dropbox and DB syncs the entire container when anything inside the container is changed because the container as created is treated by DB as a single file. I am now trying Boxcryptor and while it works with 2 Macs, the 3rd continuously gets "not a valid boxcrypt folder" errors. I'll keep tinkering with it, especially since the license was $100...ouch. BC also beachballs like a big dog.
EDIT - Also with the commercial license I can't seem to open 2 encrypted folders at the same time. When opening one folder, BC force ejects a folder that is already open (so you can't copy between encrypted folders).
I use Truecrypt with Dropbox and DB syncs the entire container when anything inside the container is changed because the container as created is treated by DB as a single file.
Either you configured something in truecrypt that totally rewrites the whole "container" on each change, or dropbox lied(not surprising) about their claim that they transmit only changed blocks for existing files... -- [Sig removed by Administrator: signature can not exceed 20GB]
It's the latter. Any change to a single file resyncs the file in its entirety. So if you have a container like TC or a VM and there is any change, DB would sync the entire container.
Boxcrypt is doing what I need it to do. The KP and beach balls were caused the the version of OSXFUSE BC includes with their install. OSXFUSE 2.5 fixes it (so far).