For my laptop install, I used Option #1. My C:\BB only has two folders and about 2 Meg of data in it to corroborate "very little disk space" that Callie referenced.
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Steve

BIAB/RB 2018, Pro Tools 2018, Korg N5, Proteus F/X, JBL LSR 4328 Powered Monitors, AKG/Shure Mics.
PC: Win10, Dell Precision T5400, 1 TB SSD, 2 TB HD, 32 GB Memory, Focusrite Scarlett 18i20 Interface