> From: Jan Owoc [mailto:jso...@gmail.com]
> 
> My personal opinion is that a variant on the way you described it in
> your original mail is the best:
> zfs send your_data | your_favourite_compression |
> your_favourite_encryption > /usb_fs/backup.gz.gpg

I still say, don't receive into a file.  This is an obvious best practice 
suggestion that's written in all the manuals and all over every wiki, including 
the zfs best practices guide and solaris administration guide. 

lofiadm supports encryption.  (At least, in openindiana.)  

Make an unencrypted, uncompressed zpool.
Inside there, create a huge file.
Use lofiadm to encrypt the huge file, and make the decrypted version available 
as a lofi device.
(In fact, maybe you can apply the encryption directly to the raw device, skip 
the huge file?  That would be nice.)
zpool create, compression=on, using the decrypted lofi device.

Now you're able to do incremental receives, into a compressed zfs filesystem, 
which is stored in an encrypted file (or encrypted raw device).


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