the content is reference from http://www.electronic-equipments.co.uk/tutorial/linux/backup_large_files.html
BACKUP
1)tar -cz mydir | split -d -b 1000m - myarchive.tgz.(include last dot)
2)md5sum myarchive.tgz.* > myarchive.md5
RESTORE
1)md5sum -c myarchive.md5
2)cat myarchive.tgz.* | tar -xz
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