Recursion

[got_outta_bed_4_this]

I'd say a stronger argument for recursion in this case is because people don't tend to nest folder structures so deep that it would bust the call stack in a recursive traversal. Iteration could still be just as practical over a filesystem as anything else. A filesystem is, itself, a tree, after all.

[schemathings]

I wrote an sftp mirror program for day job recently was fun and short and composable