Backups rhymes with:
buttercups, checkups, eggcups, hookups, linkups, markups, pickups, shakeups, buildups, buttercups, checkups, cleanups, coverups, eggcups, grownups, hangups, holdups, hookups, lineups, linkups, markups, pickups, push-ups, pushups, runups, setups, shakeups, startups
Backups sounds like:
backpack, backpacks, bagpipes, bake-offs, bespeak, bespeaks, biceps, bishop's, bishops, bishops', bookshops, boskovich, bukavu's, bukovsky, busboys