This is an AutoHotKey Incremental saver for Biab, if you don't have AutoHotKey install it
set it to Always On Top,
it will save every 2mins (120000)
SetTimer, BiabSaveAs, 120000

this is just a basic test model, a timer selector can be added to adjust
time between saves, but for now just edit the script in Notepad to change the milliseconds.
Close the GUI to stop saving.
If BB is playing it will pause and save then continue playing.
Try it on a test song that is a copy of your original.
You should get:

my song.SGU
my song[001].SGU
my song[002].SGU
my song[003].SGU

Remove the .mp4 and unzipp and run.
ReaTrak Biab & Plugin in Reaper
Free Biab Chord Picker Tool