update: safety first!
when it comes to important files: safety comes first
thus recommend to the user that wants to go pro the following backup system:
- have two complete backups at two different places:
- backupA: at the company, USB 3.0 (! THE MORE DATA IS BACKED UP THE MORE SPEED IS NEEDED (or restore might take DAYS!)) connected to the server, doing daily incremental backups
- backupB: being a fire-proof double-metal casing (EMP proof) vault at a different place (home?)
- change those backups every day if possible otherwise every week
- if ransomeware destroys backupA then in the worst case scenario, one day or one week of work is gone
- remember: whatever is physically connected to the server, can be encrypted by ransomeware
- have the backup strategy tested once a year
- where the backup is restored completely on a backup-server, to test if all data is there and how long the process takes (USB 2.0 is definitely a massive bottleneck)
rsync is a cool beast with a billion options it allows you to ssh-secured transfer your backups to remote locations…
- does chunk-wise md5 integrity check on files if files differ only slightly it will “delta-transfer” only the diff not retransfer the whole file…
- complicated: the amount of options and combinations of options can be overwhelming.
you can even specify the bandwidth to be used:
# over INTERNET rsync -vv --bwlimit=65 -r --archive --partial --append-verify --inplace --progress --compress -e 'ssh -p22' /BACKUP/DAILY/ USER@SERVER:/BACKUP/DAILY/
option because it’s CPU intense
limits the amount of upload-bandwidth used (just in case you need internet at the same time)
example script called: onlineBackup.sh
that could be called by cron every hour:
#!/bin/bash ps cax | grep -v rsyncd | grep -v grep | grep rsync > /dev/null if [ $? -eq 0 ]; then echo "Process is running." else echo "Process is not running." # backup more important first rsync -vv --bwlimit=65 -r --archive --partial --append-verify --inplace --progress --compress -e 'ssh -p22' /BACKUP/DAILY/ USER@SERVER:/BACKUP/DAILY/ fi
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