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Linux backup using tar
Let me second the pointer to backuppc. If you have several machines to backup, backuppc is a dream come true. Best thing of it is it's deduplication and compression.
Someone used my postfix smtp (port 25) to send spam mails to me
I agree 100% with SvenW. You should not be running a mail server accessible from the internet without a real good background on the topic. There are excellent books on this.