點先不會overwrite之前backup

how about複製內容到剪貼板代碼:

tar czf backup$$.tar.gz /path
??

$$ =?

you mean it will 01, 02 , 03 automatic?

我通常會用以下command ...複製內容到剪貼板代碼:

/bin/tar -cvf backup-`date +%y%m`.tar /path/to/backup
這樣便可以有不同的backup by date. 好似 backup-090227.tar