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You can read all of the detailed notes on backups here, but below are the salient points:

•  There will come a time when you lose valuable data.

•  Backups are safety copies of your files that let you retrieve them after that loss.

•  There are many and various ways to do backups.

•  With a backup strategy, you can keep all of your eggs in several baskets at once.

•  Just one additional copy of your vital data is good, but a real backup strategy involves a minimum of two additional copies.

•  If it is in the same building as the computer it isn't a backup.

•  A data integity system (such as RAID, or off-site mirroring) is not a backup – it’s an effective way of setting your mistakes in stone.

•  Cloud Storage is very useful, but clouds evaporate.

•  Do you want your data stored on someone else’s computer?

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