On 08/11/2015 10:52 AM, Diogene Laerce wrote:
Hi Rick,
Le 11/08/2015 19:18, Rick Stevens a écrit :
On 08/11/2015 09:18 AM, Chris Murphy wrote:
On Tue, Aug 11, 2015 at 3:05 AM, Diogene Laerce me_buss777@yahoo.fr wrote:
https://wiki.archlinux.org/index.php/Full_System_Backup_with_rsync
Is there a trick I don't see here ? Because if the backup of those directories is enough for a full restoration of a system state, this method is far more efficient than the others, isn't it ? As one does not need to reboot and just have to make a script or/and a cron job to make his own snapshot.
I don't consider a backup and snapshot to be the same thing. Copying (or rsyncing) some directories to another volume is a backup. A snapshot is a deduplicated copy of something at a particular moment in time, on the same volume or storage pool. It's not a backup, in that if the pool implodes both the original and snapshot are lost. A snapshot can be used as a source for a backup, since you can make a snapshot that doesn't change while the backup is happening.
I agree with Chris. Snapshots are ways of restoring data that has been perhaps corrupted or deleted or going back in time to some earlier point in the filesystems' life. They aren't backups.
Backup philosophies and techniques vary depending on what you need for your unique situation. I'm not claiming what I do is the best, but this is what works for me:
On the last Friday of a month, I plug in a big ESATA or USB3 drive and use it to store the output of Mondo Rescue. I have the backup in the form of DVD-sized ISO images I can burn DVDs from and there is a recovery DVD you can boot from. That gives me a backup usable to restore to bare metal.
Once a week (or more often if there's been significant changes), I use a _different_ ESATA or USB3 drive and run an rsync that backs up everything except a few things (/proc, /sys, /dev, /media, /var/log/journal, various caches, etc.) to a directory on that external drive based on the hostname and date I ran the backup. That permits me to restore data that's a bit more recent than the MondoRescue stuff.
I'd be happy to share the MondoArchive and rsync scripts if you wish. Tweak to suit your needs.
Thank you for the offer.
I'm going to stick with RedoBackup but I'd really like to have a look at your rsync scripts, and maybe at what various caches you think of.
The rsync backup is done via this script:
---------------------- CUT HERE -------------------------------------- #!/bin/bash # Back up system to a specific directory given on the command line. Excludes # the /proc, /sys, /dev and /media directories MYHOST=`hostname` TODAY=`date +%d-%b-%Y` if [ $# -lt 1 ]; then TGT="/media/500GB-Drive/Backups/$MYHOST-BackUp-$TODAY" OPT="" else TGT="$1/$MYHOST-BackUp-$TODAY" OPT="--exclude=$1/***" fi
nice -n 19 /bin/rsync -avXA --exclude-from=/etc/skipdirs.rsync $OPT / $TGT ---------------------- CUT HERE --------------------------------------
And the "/etc/skipdirs.rsync" file is:
---------------------- CUT HERE -------------------------------------- /proc/* /sys/* /dev/* /media/** /var/log/journal/* /BACKUPS/*** **/.cache/google-chrome/*** **/.ccache/*** /run/media/** var/lib/docker/* ---------------------- CUT HERE --------------------------------------
Obviously, change the "TGT" bit to reflect where your drive is located and modify the skipdirs.rsync file to reflect your needs.
As far as the mondoarchive stuff:
---------------------- CUT HERE -------------------------------------- #!/bin/bash # runmondoarchive.sh - Run mondoarchive with standard options
# Only allow this script to be run as the root user... if [ $EUID -ne 0 ]; then echo "This script must be run as the root user. Exiting." exit 1 fi
# Grab this host's name... THISHOST=`hostname -s`
# Get the date as mm-dd-yyyy... DT=`date +%m-%d-%Y`
# Say where the images are to be saved... DEST=/media/1TB-Drive/Backups/MondoImages
# Scratch directory... SCR=/tmp/mondoscratch if [ ! -d $SCR ]; then mkdir -p $SCR fi
# Temp directory... TMP=/tmp/mondotemp if [ ! -d $TMP ]; then mkdir -p $TMP fi
# Set how big the images can be... #SZ=640m # CD/CD-R SZ=4480m # DVD/DVD-R
# Call MondoArchive. Arguments are: # # -O Back up the host # (you can add "-V" to verify images # against the current filesystem) # -i Create ISO files # -p $THISHOST-$DT Specify the prefix each ISO image will # have (hostname-dd-mm-yyyy) # -I "/" Back up EVERYTHING from the root on down # -E "/media" Do NOT back up anything in "/media" # -d $DEST Destination where ISO images will go # -s $SZ Set the maximum size of each ISO image # -S $SCR Set scratch directory (where ISOs are # built) # -T $TMP Set temporary working directory # -z Archive extended attributes of files CMD="mondoarchive -O -i -p ${THISHOST}-${DT} -I "/" -E "/media" -d ${DEST} -s ${SZ} -z" echo -e "About to run:\n\t$CMD" $CMD ---------------------- CUT HERE --------------------------------------
Again, modify as you see fit. ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, AllDigital ricks@alldigital.com - - AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 - - - - I haven't lost my mind. It's backed up on tape somewhere, but - - probably not recoverable. - ----------------------------------------------------------------------