So you've availed yourself of this generous, but time-limited offer. You've already max'd out your ISP's fair-usage policy by uploading the entire contents of your hard disk to "the cloud".

Some time later, when you've changed ISP, lost your laptop and all the secret government data it contained - you say to your boss "no worries, mate. I uploaded all that sensitive data to a third party. All I have to do is pull it all back down again". In true cliche-ridden TV drama style, he/she says "OK, you've got 24 hours", so off you go.

Now, it turns out that the data you sent up incrementally over several weeks, all has to be restored in one long session. You start on the mammoth task - hoping that your new ISP won't notice and cut you off before you're done. The restore starts well: 1MByte/sec. Since you've lousy at maths, you don't realise that this alone will blow your 24 hour deadline. As time goes on, the speed drops - your ISP is shaping your download traffic. 1 MB/Sec becomes 500KB .. 400 .. 300. Once the kiddies get out of school and start goofing around on the internet the speed drops even more. At this point you get out your calculator and work out it'll take a week to get all your data back.

When you start your new job, you realise the folly of your ways. Pop out to the computer shop for a DVD writer and a 100 disks and use this for future backups. Of course, no-one told you that DVDs (esp. cheap ones) degrade over time.

<disclaimer>

I'm a very happy and satisfied Mozy user

</disclaimer>

Services like Mozy aren't intended to be a "whole machine" backup service, they are meant to be an automatic "saving your work as you go along" service. Or an "I'll set this up for my Mum and Dad so that their documents are automagically backed up" service, where they will call me if something needs restoring.

More than twenty years ago, a (then) colleague said to me "it is always worth making the regular backup process easier at the expense of making restoration harder", and I still maintain this is true. Restoration is a rare process where users are prepared to put in effort to get their data back. Mozy has a very simple way to get back a single fileafter an oops moment, and you can recover all or any selected part of your backup set.

Is Mozy easy enough for my mum and dad to configure? Absolutely not. Is it easy enough for me to configure for them, and leave it running until they need a restoration? Yes. If it stops working, will it give them a signal to call me? Yes.

Frankly, in a Windows system there's no point in taking backups of the complete machine, most people consider the machine an appliance running Windows and a small set of applications (Office, Outlook and a couple of other bits). They don't care about backing up their *machine*, they care about backing up their *documents*, and Mozy does this rather well *if* it's set up by someone who knows what they're doing.

The magic is that it runs overnight without you having to do anything or be responsible for and solid media at the end of the day. a lot of our sites choose to backup tapes, they have to do so after office hours and it can take 2 hours to run. so they lave it to run overnight. Which is fine until some chavs break in and steal all your computers, then you have lost a days work, assuming you don't keep old tapes in the building as well and they stole them too.