Just to echo the thoughts above. I used to use BIAB for exactly the same purpose as you. Now it's just a hobby. However, I do suggest you buy the biggest possible package you can afford. I didn't but soon realised i had to upgrade. Not because the smaller packages are no good, but because the bigger packages open up even more creative avenues.

You get all the midi styles with the basic package (I think) but the quantum leap is the RealTracks which are as described above live recordings of actual musicians but which play exactly following the chords, tempo and key your select.

Buying piecemeal is not good value. I will never use most of the jazz styles and realtracks but I do use country, folk and pop. Its better value to buy everything - even if it includes things you think you'll never use - rather than buying bits. You will never run out of the music you need - even borrowing from styles you thought you don't want like me.

and once you are on the BIAB train its easy to keep up to date with the christmas sale which is a cheap way of buying the program engine upgrade and a host of new realtracks. and don't forget PG Music offers easy payments. Just one or two gigs will pay for all the backing tracks you will ever need.

quick word of advice about creating backing tracks. rough out your song in BIAB. then for detailed editing and tweaking open the song in RealBand. You can easily edit individual instrument tracks, regenerate solos and change timing and key if you want to.

jump in and start. if you get stuck ask the forum. that's why we're here. i started with BIAB when it was on floppy discs and so its been easier to keep up as it grows. from scratch in 2020 it might look like a steep learning curve to take full advantage of what BIAB and RB have to offer but if you look at some of the help videos i bet you can produce a simple backing track almost as soon as you start. then add solos and any bells whistles you need.

do it and you'll never regret it!