Backup Frequency
Backup frequencies depend primarily on how much the data on your pc changes and how important it is to you. If you use your computer randomly, only once or twice per week, then a monthly back up if more than sufficient. If you use your computer daily, you should consider a weekly back up. If you use it for work, and therefore add important data daily, you should back up your data daily to minimize any potential damage to your work.
Businesses typically do weekly full backups on the weekends and nightly incremental backups Monday through Friday. The hardcore approach is to do a full weekly backup, duplicate it, store the copies each in separate locations (different cities/states is even better), and then do nightly incremental backups. That way, even should something catastrophic happen (such as the destruction of the building with one set of backups), the business is still never more than one week out of date. Of course, companies employ IT staff to perform such tasks.
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