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Other factors include what files are being excluded (to reduce the backup size) - by default ATI will exclude such as the system pagefile, swapfile and hibernation files as well as System Volume Information (used for System Protection / restore point and snapshot type data). The speed & performance of your CPU (processor), amount of memory, performance of your internal drive, the type of files included in your source data selection, the level of compression chosen, what other activities are happening on your computer at the same time etc. Robert, difficult to say how long it would take as there are a lot of factors involved besides just the amount of data to be backed up.
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