Just looking back at this old article and responses, I will throw out that my home network has now grown to 34TB of storage on two 4-drive NAS devices and two docking stations for SATA and USB drives besides five computers, and keeps expanding as I digitize over 100 years of family photos from B&W, to 35mm slides, thousands of digital camera pictures, and a music library of 73,000 tracks.
Gone are the days of what we considered 'permanent' offline storage. Now we have to plan on at least double our needed capacity just to keep safe single backup. Just yesterday the machine with my 1TB of digital music failed to boot up due to what seems to be a failed power switch. Fortunately, I have two digital backup copies, but even those are still on mechanical drives.
One question is should I absorb the expense of repairing a six-year-old machine, if parts are available, for the music library or just buy a new one.
And this all reminds me of the days (1960's-1970's) of the old 9" reels of magnetic tape on the 6-foot high/3-foot wide tape drives when we mounted tapes on two drives and did tape-to-tape copies merging in new historical data from very limited disk storage on a single-task computer. The issue then was how much time could you justify for the data merge versus having to design around data being stored in multiple off-line locations.
Disaster Recovery = Backup ( Backup ( Your Backup ) )