Windows batch - batch backup with xcopy

@echo off

set dir="c:\"

for /R %dir% %%f in (*.7z) do (
del %%f )

cd /d d:\7-zip\
7za.exe a -t7z "c:\backup1.%date%.7z" d:\Myfiles -mx=9
echo The folder has been archived and saved to c:\.
echo.
7za.exe a -t7z "c:\backup2.%date%.7z" c:\Pics -mx=9
echo The folder has been archived and saved to c:\.
echo.
7za.exe a -t7z "c:\backup3.%date%.7z" "d:\mydocuments" -mx=9
echo The folder has been archived and saved to c:\.

cd /d c:\
xcopy *.7z H:\Backups /F /C /Y

net use Z: https://server.com /user:abc /persistent:no
start Z:\
explorer /e,C:\

pause > nul
exit


What it does : This batch first deletes all old 7z-backups if there are any to delete and then goes on and compresses three folders using the 7za tool (find via google). Then it copies all three 7z-backups to an SUB flash drive with the letter H. After that it connects to a Webdav server and starts the explorer.
(replace server.com with the correct webdav name and user with the correct user name)