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"Legacy" filesystems will be available for some time, so you should be able to just "cp" those files. See How can I access legacy filesystems - Linux Virtual Desktop VDI FAQ for more details. However, be aware that legacy systems will be switched off at some point during the migration process so please ensure that you copy any required information as soon as possible.
However, you may still want to use rsync as a convenient way of copying only changed files. Eg
| Code Block |
|---|
$ rsync -av /originfilesystem /destinationfilesystem |
Either the origin or the destination of rsync can be remote, but not both.