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windows - batch script to backup a directory to a zip (or 7z) file with a timestamp in its filename

sample script:

#script name: run_backup.bat

set myDate=%date:~-4%_%date:~3,2%_%date:~0,2%__%time:~0,2%_%time:~3,2%_%time:~6,2%
set BackupFile=d:\backup\backup_appname_%myDate%.7z

"C:\Program Files\7-Zip\7z.exe" a -t7z -mhe=on %BackupFile% D:\directory-to-backup

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