Sync from 4 drives to one portable drive? How

[jezsik]

My old XP machine has four drives. I can now put the entire contents onto a 1T
portable drive for backup. How the heck do I get FreeFileSync to pull from
four drives and copy the contents to the four folders I've created on the
external drive? It only seems to accept one drive at a time.

[Zenju]

Use multiple folder pairs; one pair for each drive.