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Data Backup
Although modern computer equipment is generally very reliable, is does sometimes fail. Hard disks are more prone to failure than most other computer components because they have many mechanical parts (and not just electronics).
Remember that your hard disk contains all of your personal data much of which cannot be replaced if it is lost. It is vital to ensure that you are prepared for the chance of a hard disk failure. This involves taking regular backups of your data and being able to recover data should your drive fail.
It is surprising, considering the increasing reliance people place on their electronic data, how few people keep adequate and regular backups of their data.
I do backups as well onto a variation of formats, including CD and DVD.