Hello Witek,
The problem is that although we technically can encrypt a file as soon as it appears in a folder, it won’t work and it’ll be a race between the synchronizing agent and AxCrypt. AxCrypt may win this race most of the time, but we can’t guarantee it.
The reason it won’t work at all, is because it’ll confuse applications. Let’s say you start Word, start editing a document, and then hit “Save As”. You save it is “stuff.docx”. AxCrypt sees it and immediately encrypts it as “stuff-docx.axx”, and wipes “stuff.docx”. This really confuses Word, which thought it just created the file “stuff.docx”…. There are many variants of this scenario, but in the end it just doesn’t work reliably enough.
We’re still testing out how AxCrypt interacts with Drive File Stream, and what we can do about that. With backup and sync the operation is similar to the current Drive implementation.