Steam has some backup feature. I do backups of my games. Compressed to slow HDD dedicated to backups. Faster to install than downloading again from network. Don't know though how much will that help

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silon42 3 hours ago | parent [-]

Can one download a backup first, then install (using usb drive) into an "offline" machine first (without steam/online?)

	▲	nemomarx 3 hours ago \| parent [-]
		Yeah, if the game is set up to not use steam as drm. You can check by going to the installed files and running the exe directly - in most cases it'll still launch even if you're signed out.