Linux tar full Incremental backup script

As the company's website increases and the occupied space increases, write a script. Under Incremental Backup
 
#! /Bin. bash
# Backup 00:00:00
Week = 'date + % U'
Date = 'date + % Y-% m-% d'
Year = 'date + % y'
Month = 'date + % m'
Day = 'date + % d'
Bakpath =/var/bak/webbak
Webpath =/var/htmlwww
Wzbakup =/var/bak/webbak/wzbf
Backup = $ bakpath/$ year/$ month/$ (date + % d-d "1 day ago ")
Web = (web1 web2 web3)
For I in 'ls $ webpath'
Do
If [[$ week-ne 1]; then
If [! -D $ backup]; then
Mkdir-p $ backup/$ I
Mkdir-p $ bakpath/$ I
Fi
 
Tar-g $ bakpath/$ I .txt-zPcf $ backup/$ I .tar.gz $ webpath/$ I
Else
If [! -D $ wzbakup]; then
Mkdir-p $ wzbakup
Fi
Cd $ wzbakup
Tar-g $ bakpath/$ I .txt-zcPf $ PWD/$ I ?date.tar.gz $ webpath/$ I
Rm-rf $ I $ (date + % Y-% m-% d-d "7 days ago" 2.16.tar.gz
Rm-rf $ backup /*
Fi
Done