All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: photography and
Thank you for purchasing through links and ads on this site.
diglloyd Deal Finder...
Buy other stuff at
Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
Handpicked deals...
$4499 $2649
SAVE $1850

$1699 $1199
SAVE $500

$5999 $5499
SAVE $500

$181 $110
SAVE $71

$7699 $7199
SAVE $500

$4499 $2649
SAVE $1850

$400 $330
SAVE $70

$4499 $2649
SAVE $1850

$4999 $4599
SAVE $400

$2350 $1950
SAVE $400

$1699 $1299
SAVE $400

$799 $699
SAVE $100

$200 $157
SAVE $43

$1997 $897
SAVE $1100

$250 $110
SAVE $140

$1398 $898
SAVE $500

$1199 $1099
SAVE $100

$3999 $2499
SAVE $1500

$200 $170
SAVE $30

$3999 $2499
SAVE $1500

$1498 $1398
SAVE $100

$2497 $1897
SAVE $600

$748 $598
SAVE $150

$899 $699
SAVE $200

$1300 $1100
SAVE $200

“You Saved My Bacon” (Always keep 3 backups)

Joshua C writes:

I've been reading your site for years and following a modified version of your backup strategy (no offsite, just a drive in a firebox away from the computer).

My current RAID enclosure was getting flaky so I decided to replace it. The problem was temperature and fan related so I was migrating the drives to the new enclosure

I knew I would have to reformat but I've got two backups so that's OK. That is until I accidentally installed my clone drive as one of the drives in the RAID without noticing. Bang! My original and my clone were gone. My heart stopped. This RAID contains ALL my image files.

But since I have another backup I am rebuilding as I write this. One human error could have wiped me out. Following your guidelines has kept me going.

MPG: See the backup pages for critical backup strategy discussions.

Two backups are far better than one: with one backup, a failure means you’re down to a single master copy, possibly out of date. With two backups, loss of one backup means you’re down to one remaining master copy (possibly out of date), as with Joshua C.

Anything less than three complete backups should be a source of uneasiness for anyone who values their data. For starters, spreading the risk (physical risks, bonehead mistakes, out of date backups, drive failures, splitting across sites, etc).

Time Machine backups should be considered strictly a nice-to-have additional redundancy for short term protection. It does not count for the “three”. For one thing, Time Machine has had historical bugs that left data unprotected (and I don’t trust Apple anymore, what with the massive increase in bug count in Mavericks), for another it is unbootable, and it’s also typically subject to the same physical risks. Also, if it fills up, you’re out of luck until something is done, whereas clone backups used properly can never fill up provided they are as large or larger than the original (e.g. some amount of data on a 4TB original can never overflow a 4TB clone backup).

Here is a good general purpose backup drive suitable for all Macs. 4TB or at least 3TB capacity recommended.

You do NOT need RAID for backup; it is far better to have two independent drives than a RAID mirror. RAID is a fault tolerance or performance solution, NOT a backup solution.

An original Master volume, and its clone
(Store the backup clone away from the computer)


View all handpicked deals...

Apple 13.3" MacBook Pro (Mid 2017, Space Gray)
$1699 $1199
SAVE $500 | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__