A backup is a simple process which can be defined as follows: You use a backup to save data on a suitable storage medium (e.g. an external hard drive). Once you have performed a backup, a backup copy will be available which contains important data in redundant forms (i.e. as a duplicate). If you need to access old data or if you experienced a sudden loss of data, the backup can be used to restore all or part of the data. This can be done manually (e.g. copying back individual files) or using a special backup software with restore functions.
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