[e12e]

Encfs is pretty opaque -- afaik modifying a file will at least change an entire block, possibly the entire file. Two identical files will look completely different (per file IVs) -- so no deduplicaton is possible.

But adding and removing files works as expected, so adding a few files to the encfs system, should translate to the same number of files added to the underlying folder.

[Tho85]

EncFS allows to deactivate some of these features at the price of reduced security. The EncFS manpage [1] has a good explanation of all the tunables. If you want to use Boxcryptor, you're even advised to deactivate most of these features [2].

[1] http://linux.die.net/man/1/encfs

[2] https://boxcryptor.desk.com/customer/portal/articles/565934