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Best Backup Strategy?

Slides: single copy, take a chance, scan the important one so it become digital asset.
Digital assets:
- Images I currently work on: LaCie 2Big 2x3TB RAID1 as main data disk on MacPro; SSD is only used for OS, application, and scratch disk.
- Local backup. LaCie 4Big 4x4TB RAID 1
- Off-site (70 miles away): LaCie 2Big 2x6TB RAID 1

Buying hard drives is quite affordable and convenient. RAID1 protects against single disk failure. I used to have Buffalo Tech NAS drives, but with better LANs and better transfer rates over USB3 and thunderbolt, ethernet is no longer a good option.

I used to have CDs/DVDs but 1 TB = some 140 DVDs, plus they degrade over time. Short of a widespread electromagnetic blast, I should be fine. And then a few images will be the least of my problems.
 
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