I'm not sure about the mentioned services, but JungleDisk does encryption and does "duplicate elimination" (allegedly on blocks of a file, not just on the whole file). They're pretty tight-lipped about their process, but from what I've been able to determine, it looks like they do the "duplicate elimination" prior to (locally) encrypting.<div>
<br></div><div>Jeff</div><div><br><br><div class="gmail_quote">On Thu, Jul 28, 2011 at 9:30 AM, Steven Lefevre <span dir="ltr"><<a href="mailto:lefevre.10@osu.edu">lefevre.10@osu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On Thu, Jul 28, 2011 at 8:23 AM, Scott Merrill <<a href="mailto:skippy@skippy.net">skippy@skippy.net</a>> wrote:<br>
<br>
> If you don't want to manage the server end, Dropbox remains a very<br>
> good product. If your data is sensitive, you should encrypt it<br>
> yourself before uploading it to Dropbox. TrueCrypt and GPG are good<br>
> solutions for this.<br>
<br>
</div>I assume these services do incremental backups for the most part.<br>
<br>
If you have an encrypted volume, and you change its contents, can you<br>
do an differential backup, or does that file change so much<br>
<br>
In other word, suppose I have a 1 GB encrypted file that I back up on<br>
an online service. I open the volume with truecrypt, and change a few<br>
lines in a plain text file. How different is the encrypted file? Can<br>
it be backed up against the existing backup file incrementally?<br>
<br>
Steve Lefevre<br>
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