How to backup Ubuntu 17.10 to disk image

Linux
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1

hi
thanks for the supoort first/
how can i backup my os to image every day.

2

Are you talking about making backup image of entire hard disk? If so

  1. Boot from a live Linux CD/USB media
  2. Make sure no partitions are mounted on the target hard disk.
  3. Mount the external hard disk or NFS
  4. Backup the drive:
dd if=/dev/sdX conv=sync,noerror bs=64K | gzip -c  > /path/to/mount/usb/backup.img.gz

Input drive is /dev/sdX and output /path/to/mount is either nfs or usb mount point. Be careful with if= and of= parameters.

3

in the begining thanks for the support.
can it done from my ubuntu when he is mount

4

Noop. You need to live image. Only files can be backup up when mounted.

5

it is possible with btrfs using snapshots, but with ext3/4 filesystem nope