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Top Forums UNIX for Beginners Questions & Answers Should I use a CoW filesystem on my PC if I only wanted snapshot capabilities ? Post 303045040 by sreyan32 on Wednesday 11th of March 2020 05:30:17 AM
Old 03-11-2020
Quote:
Originally Posted by stomp
Encryption makes the backup task more difficult.
Unfortunately I need it, I can't avoid it.

Quote:
Originally Posted by stomp
Since you're a beginner, a CloneZilla can be a fallback solution until you're famillar enough with your linux os. With CloneZilla you can save and restore the os partition without knowing very much about linux.
Okay Clonezilla is not an option for me. Simply because I don't have that much of space to spare. It seems I am not getting the answer that I want because I am not asking the right questions.

So let me apologize for that, and let me ask if the following workflow is possible on Linux.
  1. I have a single 1 TB SATA hard disk.
  2. I will be using an encrypted LVM with ext4 formatting.
  3. Now lets say before an update or a dist-upgrade I take a snapshot of the root partition and store that snapshot in the root partition itself.
  4. The upgrade or update fails or is causing problems, and the system is no longer bootable to my desktop.
  5. I boot into a live CD.
  6. Mount my encrypted partitions, and /proc, /sys and /dev from the live CD.
  7. Chroot into my system.
  8. Find the saved snapshot.
  9. Revert it.
  10. Exit from Live CD environment and boot back to the reverted system.

Main Challenges:
  1. Will the backup process work ?
  2. Will the Live CD of my OS contain CLI tools to decrypt encrypted partitions ?

As you can see, I cannot forego full-disk encryption nor do I have that much space or time for a full cold boot snapshot of a partition.

So is the above workflow possible ?
 

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BOOTCDBACKUP(1) 						   bootcd utils 						   BOOTCDBACKUP(1)

NAME
bootcdbackup - create a bootable offline backup of a unix system SYNOPSIS
bootcdbackup [-i] [-v] [-s] [-c <config directory>] [-url <url] [-nomount] [-2diskconf <file>] <dev> <name> <builddir> DESCRIPTION
bootcdbackup creates a offline backup from a installed system. You need a running bootcd to boot the system with. This CD/DVD is booted on the system and bootcdbackup creates a bootable CD/DVD with the bootcd kernel and the backup disk as tar-file. To restore or clone the system, boot the CD/DVD image and install it with bootcd2disk -c <name> on the system. bootcdbackup can try to discover the disk partition by searching for fstab on the given partition. A other way to backup the partition ta- ble is the program bootcdmk2diskconf which creates a configuration file on a running system. OPTIONS
-i The bootcdbackup runs in interactive mode and you can run each function manually. This option is useful for debugging. -v The option "-v" (verbose) adds messages on running. -s This option can be used to disable interactive questions and to try to ignore errors. -c <config directory> The configuration directory which includes the file "bootcdbackup.conf", default is "/etc/bootcd". -url <url> If bootcdbackup is slow on your system (because of a slow CD/DVD drive or the HP ILO virtual CD interface), you can use an image server to get the image from. bootcdbackup use the SWAP partition of your upcoming system as temporary space and copy the image from the configured image server to this partition and use it as image. The image server url is configured with this option. -nomount The target disk should not be mounted and no search for fstab is done. --cpio Normally as backup tool star will be used if selinux files have to be backed up and cpio will be used if not. With this option the usage of cpio can be forced. --star Normally as backup tool star will be used if selinux files have to be backed up and cpio will be used if not. With this option the usage of star can be forced. -2diskconf <file> The parameter configures a bootcd2disk.conf for the restore of the system done by bootcd2disk. The configuration file can be created with the command bootcdmk2diskconf. <dev> Configures the device where bootcdbackup finds the file "fstab" and discover the configuration for the restore. <name> The name of the backup (no blanks!) is used on the creation time and to restore the backup with bootcd2disk -c <name>. <builddir> Builddir is an directory on the backup system where bootcdbackup build the backup CD/DVD. Space for the CD/DVD image, for compression and the data is needed! All other configuration has to be done in the config files. FILES
/etc/bootcd/bootcdbackup.conf Configuration for bootcdbackup. SEE ALSO
Documentation in bootcdbackup.conf bootcdbackup.conf(5), bootcd(1), bootcdflopcp(1), bootcdwrite(1) AUTHOR
This manual page was written by Bernd Schumacher <bernd.schumacher@hp.com> and Carsten Dinkelmann <Carsten.Dinkelmann@foobar-cpa.de> for the Debian GNU/Linux system (but may be used by others). bootcdbackup 2007-07-05 BOOTCDBACKUP(1)
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