1 MB truecrypt filesystem file created, formatted FAT with AES-Twofish-Serpent encryption and SHA512 hash.
Copied it for empty versus adding a file.
Added a 453 byte file to one.
command: diff test.tc test\ \(copy\).tc -a > truecrypt.diff
du -h truecrypt.diff
8.0K truecrypt.diff
It changes far too much.
That's because TrueCrypt uses blocksize of 4K.
I've been using spideroak, and I have one complaint which is restorations are sometimes fairly slow (10 minutes to pull down a 300k file). Sometimes it's fast-ish (30 sec) , so I guess it's where the file is in their cloud.
How is restoration time on Dropbox?
As fast as Amazon S3.
When it is incorrect, it is, at least *authoritatively* incorrect. -- Hitchiker's Guide To The Galaxy