From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail1207.opentransfer.com ([98.130.1.227]:42607 "EHLO mail1207.opentransfer.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751819Ab3F3ROd (ORCPT ); Sun, 30 Jun 2013 13:14:33 -0400 Message-ID: <1372612472.13762.18.camel@miguel-MacBookPro> Subject: btrfs send /receive : having problems sending a snapshot back to the original partition From: Miguel =?ISO-8859-1?Q?Negr=E3o?= To: btrfs list Date: Sun, 30 Jun 2013 18:14:32 +0100 Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi I'm now sucessfully backing up my ubuntu machine using btrfs send and btrfs receive. Essentially I do mount /dev/sda3 /mnt cd /mnt btrfs subvolume snapshot @ backups/@-backupNew btrfs send -p backups/@-backupOld backups/@-backupNew | pv | btrfs receive /media/miguel/huge/backups/@ This is working great and most sends take less then a minute. I did a diff of the original with the send snapshot and except for sockets and other "weird" files like in /dev all the other files seem to be exactly the same. Now I was testing retrieving a snapshot back from the backup disk to the original partition: If I do btrfs subvolume delete @-backupOld and then do btrfs send -p /media/miguel/huge/backups/@/@-backupNew /media/miguel/huge/backups/@/@-backupOld | pv | btrfs receive/mnt/backups I get an error: ERROR: could not find parent subvolume Sending via files instead of pipes I can see the error is in btrfs receive, the btrfs send completes without errors. Is it what I'm trying to do not possible ? I'm I using the wrong syntax ? It would be really handy to be able to do this, to make it easy to go to an old snapshot without having to transfer it in it's full size, instead transferring just the diff. Also, how is the -c (clone) option used and does it do ? It's not clear to me what is it's function, and I haven't seen any example using it on the web. thanks, -- Miguel Negrão http://www.friendlyvirus.org/miguelnegrao ps: I've set up a Haskell script to do the backups, in case it interests anyone it's here: https://gist.github.com/miguel-negrao/5895613