QNAP NAS, eSATA , Solaris and backing up

Given:

  • QNAP TS-439 Pro NAS with 4 x WD20EADS in RAID-5
  • eSATA/USB Sharkoon QuickPort Pro SATA cradle
  • WD20EARS
  • 1.7TB data on RAID-5

Guess, how long will it take to back up 1.7TB of mostly big files to a directly connected eSATA disk using standard GUI commands?
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