Migrating NAS data from any third-party storage to HNAS will need to be performed via a client end copy. I generally recommend using Robocopy, as it is a reliable and free tool for this purpose. Additionally, you may consider SecureCopy for faster copy speeds and enhanced logging capabilities.
For more advanced features, you might also explore Komprise and DataDobi, although these options come with associated costs.
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Abhishek Saxena
Hitachi Vantara
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