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How much data is transferred? Will my data allowance be eaten up quickly?

Merlin Server is by far the most efficient method as it only transfers the actual changes. File-based cloud services transfer entire files every time they are synchronized, which naturally eats up more of your data allowance. However, the cloud services we’re familiar with analyze which sections of a file have actually changed and only transfer those parts, keeping additional consumption in macOS within limits. Merlin Project Go does, however, need to transfer entire files each time owing to restrictions with the interfaces published by the cloud services. This is why MagicSync throttles the upload speed of changes from Merlin Project Go to consolidate as many changes as possible into one upload as in most cases it doesn’t matter whether changes arrive immediately or with a few minutes’ delay. That said, if changes are urgent you can force Merlin Project Go to upload changes immediately.