I use Crashplan to backup mostly my pictures and Crashplan charges $60 USD for unlimited storage so less storage won't save me any money.
If the payback period for a NAS comparing to Crashplan is 7 year, I think Crashplan still makes sense. Because 7 years from now, the $700 NAS I build today will be worthless and I have to rebuy a new NAS+harddisks and start over. Plus I lose the offsite backup advantages provided by Crashplan in these 7 years.
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