I want to back up a directory to a second drive. Basically, I want to copy all changed files, delete any removed files, but avoid copying more than necessary. Essentially, the equivalent of RD /S /Q dest & COPY /S src dest, but without copying unchanged files. This seems like a common enough task, but I'm finding it hard to get the correct command. COPY /S /C src dest nearly does it, but doesn't delete any files removed from src. SYNC /S /W src dest also nearly works, but if a file in dest is modified, it copies it back. My best option so far is SYNC /S /W, and try to ensure that the destination files are never modified. But as this is for backup purposes, I'm a bit nervous. COPY /S /C isn't really useful, as if I use this for a relatively volatile directory (my working directory, for instance) the backup will grow indefinitely with stuff that I tried for a while then deleted. Have I missed any good options? (Hmm, I keep hearing good things about the MS ROBOCOPY utility - maybe I should look at that. Does anyone know if that would help me?) Paul.