If you would like to backup your presets, please backup the following folders:

(please replace "PositiveGrid/BIAS_Amp2" with "BIAS_FX" if it’s BIAS FX,  "Bias" if it's BIAS Amp 1)

Mac

/Users/(User name)/Documents/PositiveGrid/BIAS_Amp2/GlobalPresets

/Users/(User name)/Documents/PositiveGrid/BIAS_Amp2/ModulePresets

Windows

C:\user\(user name)\documents\PositiveGrid\BIAS_Amp2\GlobalPresets

C:\user\(user name)\documents\PositiveGrid\BIAS_Amp2\ModulePresets

Or you can just backup the whole PositiveGrid/BIAS_Amp2, BIAS_FX and BIAS_Pedal folders in Documents just in case.