SMB Server Side Copy - #14 by TheColin21 - I once made quite a fool of myself using TeraCopy with TrueNAS - beware: it does not support smb server side copy.
Otherwise great software though…
I know, rsync can have it’s difficulties sometimes but for a simple “get all my data here once” job using it with TrueNAS’ GUI should be doable for anyone who setup a TrueNAS box I think.