How to use differential and Incremental Backup in linux

Article Title: how to use differential and Incremental Backup in linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Running properly in redhat Linux 7.2
　　
Mybackup. sh
Code:
　　
#! /Bin/sh
Umount/mnt/bak
Mount/dev/sdb1/mnt/bak
　　
If ['date + % d' = 01] # complete backup on the first day of every month
Then
Bakdir = "/mnt/bak/daybak/month/" 'date + % m % d'
Zl = "" # complete backup
Else
Bakdir = "/mnt/bak/daybak/" 'date + % d'
Zl = "-N" 'date + % Y-% m-01 00:00:01 '; # differential backup
# Zl = "-N" 'date-d-1 day + % Y-% m-% d 00:00:01 '# daily Incremental Backup
Fi
　　
Tmpbakdir =$ {bakdir} tmp
Rm-rf $ {tmpbakdir}
Mkdir $ {tmpbakdir}
Tar "$ {zl}"-czf $ {tmpbakdir}/www. tgz/var/www/html
Tar "$ {zl}"-czf $ {tmpbakdir}/etc. tgz/etc
Tar "$ {zl}"-czf $ {tmpbakdir}/mysql. tgz/var/lib/mysql
Tar "$ {zl}"-czf $ {tmpbakdir}/home. tgz/home
Tar "$ {zl}"-czf $ {tmpbakdir}/name. tgz/var/name
Rm-rf $ bakdir
Mv $ tmpbakdir $ bakdir
Umount/mnt/bak
　　
Set mybackup. place sh in/etc/cron. in daly, you can achieve monthly cyclic differential/Incremental backup to facilitate data recovery. I used differential backup. If you want to save space, you can use daily total backups. However, it will be troublesome to restore data, in addition, you can easily change the above script to weekly loop.
　　
The other method of Incremental backup is to use the find command, for example, to back up only the files modified one day ago.
Code:
　　
Find/var/www-type f-mtime-1-print>/tmp/filelist.txt
Tar-cz-T/tmp/filelist.txt-f/mnt/bak/www. tgz