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doc | Emergency Backup Recovery - format version 2 | /doc/BackupEmergencyRestoreV2/ |
Emergency Backup Recovery without Qubes - format version 2
This page describes how to perform emergency restore of backup created on Qubes R2 Beta3 or earlier (which uses backup format 2).
The Qubes backup system has been designed with emergency disaster recovery in mind. No special Qubes-specific tools are required to access data backed up by Qubes. In the event a Qubes system is unavailable, you can access your data on any GNU/Linux system with the following procedure.
Note: In the following example, the backup file is assumed to be both encrypted and compressed.
-
Untar the main backup file.
[user@restore ~]$ tar -i -xvf qubes-backup-2013-12-26-123456 backup-header backup-header.hmac qubes.xml.000 qubes.xml.000.hmac vm1/private.img.000 vm1/private.img.000.hmac vm1/icon.png.000 vm1/icon.png.000.hmac vm1/firewall.xml.000 vm1/firewall.xml.000.hmac vm1/whitelisted-appmenus.list.000 vm1/whitelisted-appmenus.list.000.hmac dom0-home/dom0user.000 dom0-home/dom0user.000.hmac
-
Verify the integrity of the
private.img
file which houses your data.[user@restore ~]$ cd vm1/ [user@restore vm1]$ openssl dgst -sha512 -hmac "your_passphrase" private.img.000 HMAC-SHA512(private.img.000)= cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e [user@restore vm1]$ cat private.img.000.hmac (stdin)= cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e
Note: The hash values should match. If they do not match, then the backup file may have been tampered with, or there may have been a storage error.
Note: If your backup was hashed with a message digest algorithm other than sha512
, you must substitute the correct message digest command. A complete list of supported message digest algorithms can be found with openssl list-message-digest-algorithms
.
-
Decrypt the
private.img
file.[user@restore vm1]$ openssl enc -d -pass pass:your_passphrase -aes-256-cbc -in private.img.000 -out private.img.dec.000
Note: For multi-part files, a loop can be used:
for f in private.img.*; do
openssl enc -d -pass pass:your_passphrase -aes-256-cbc -in $f -out
${f/.img/.img.dec}
done
Note: If your backup was encrypted with a cipher algorithm other than aes-256-cbc
, you must substitute the correct cipher command. A complete list of supported cipher algorithms can be found with openssl list-cipher-algorithms
.
-
Decompress the decrypted
private.img
file.[user@restore vm1]$ zforce private.img.dec.* [user@restore vm1]$ gunzip private.img.dec.000.gz
Note: If your backup was compressed with a program other than gzip
, you must substitute the correct compression program.
-
Untar the decrypted and decompressed
private.img
file.[user@restore vm1]$ tar -M -xvf private.img.dec.000 vm1/private.img
Note: For multi-part files, a script is required:
-
Create a
new-volume-script
:#!/bin/sh name=`expr $TAR_ARCHIVE : '\(.*\)\..*'` suffix=`printf %03d $[ $TAR_VOLUME - 1 ]` echo $name.$suffix >&$TAR_FD
-
chmod +x new-volume-script
. -
tar --new-volume-script=./new-volume-script -xvf private.img.dec.000
. (The--new-volume-script
option enables multi-volume untaring.)
-
-
Mount the private.img file and access your data.
[user@restore vm1]$ sudo mkdir /mnt/img [user@restore vm1]$ sudo mount -o loop vm1/private.img /mnt/img/ [user@restore vm1]$ cat /mnt/img/home/user/your_data.txt This data has been successfully recovered!
Note: You may wish to store a plain text copy of these instructions with your Qubes backups in the event that you fail to recall the above procedure while this web page is inaccessible. You may obtain a plaintext version of this file in Git repository housing all the documentation at:
https://github.com/QubesOS/qubes-doc.git