Powershell compare huge directory tree of docs and only move new and updated

Question

Putting a plan together for moving 70k files between servers for a document mgmt system. 1200 folders is what I believe exist today.

Doing the initial copy is a no brainer. XCopy or RoboCopy.

How do I identify any new files as well as newer version of same file? Documents are autocad based.

TIA

Answer 1

look at /D parameter of xcopy :

/D:mm-dd-yyyy

Copy files changed on or after the specified date. If no date is given, copy only files whose source date/time is newer than the destination time.

Answer 2

robocopy SRC DST /l will list all new and changed files on both sides. Add /e to include new empty folders as well. Add /it to include tweaked files (same size and date, but different attributes).