<< I play acoustic guitar as a hobby and have done for a good few years off and on, what I would like to do
is record myself along with my guitar into my computer and then maybe add a few touches to the song and see what develops
I intend to purchase a usb audio interface along with additional microphones. one to record the guitar and one to record the vocal.

would I be able to record directly into BIAB and then work on the song.>>

As has been noted, users can record into BIAB. Another option you may consider provides high quality recordings, has everything in a single package to record through an audio interface directly into your PC and BIAB, but also allows you to record guitar and vocals remotely anywhere onto an SD card that can transfer tracks directly from the card into the PC, Band in a Box, or DAW.

There are many options available that should be at less cost than buying a stand alone interface and microphones. I've posted a screenshot of a high quality device costing $100 and a link to a YouTube video of an artist who did all of his early recordings on the Zoom's predecessor model to the model listed for years. All of BIAB's resources will still be available to use as well as any DAW and it resources.

Zoom H1essential Portable Recorder


Folsom Prison Blues

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.