let's talk about restoring your data
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.