Hello, The migration's proces can be hard, it"s depend of your file expose, CIFS or NFS
But in any cases you can use a spécific tool from NetApp : XCP
https://xcp.netapp.com/
You have many options, to retry the used files, but in some migrations, you need to do an initial tranfert and, some incremental, at the cutover time you need to stop share or export @source to be sure to have all files not opened
see this tools you fonid many answers for your migration 🙂