I've got a 500GB external for backup/portable stuff. Hook it up every week or two, drag and drop files and you're done. Its not automatic but its certainly not difficult.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth