Best data back-up method?

What is your opinion about the differences and advantages of these automated backup systems? How much of a memory hog is each when running?

1) WD external hard drive "MyBook" with Smart software

2) Norton Ghost software to a 2nd internal drive

3) Acronis (sp?) software to a 2nd internal drive

4) RAID1 which I know synchronizes/mirrors (I would need the PC builder to set it up, but after that, will I ever need to adjust it again? Is it permanent?)

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More about best data back method
  1. #1 is best of these. It will probably let you schedule things, plus do incremental backups (not having to do the whole drive every time).

    #4 is just drive redundancy, but it doesn't get back deleted files, virus-trashed disks, etc.
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