Why not install the instruments and tracks to an external USB or even better, an SD drive (most Macs have a built in SD slot these days)? You can get a 32G USB thumb drive or an SDHC card for cheap—64G (and larger) drives and SDXC cards aren’t that much more. In fact, you would move your 2014 data over and free up space on your main drive.

Don’t know what Mac you have—some older Macs may not support SDXC cards without an external reader so check first. SDHC is limited to 32G while SDXC is available up to 512G. BTW, you’ll see different speed ratings on SD cards—an issue for high speed cameras but not for you. USB 2 is fast enough for this.
SDXC at Best Buy

Once you’ve moved your libraries and tracks, it’s easy to tell BIAB where to find them. This is why you move your older and newer data over so that it can be found in the same place.

You still install the BIAB app and supporting files onto your boot drive, of course.

BIAB 2023 Audiophile, 24/60 Core M2 Mac Studio Ultra/8TB/192GB Sonoma, M1 MBAir, 2012 MBP
Digital Performer 11, LogicPro
Finale27.4, Dorico5, Encore5, SmartScorePro64, Notion6, Overture5