Save and Load Weight Paint values

Hi,

I’ve done some weight painting and would like to save those weights to an external file so I can load them back at some point. How would I do this in Blender?

I need to do this as I’ve realised I need to adjust the pivot points of my rigify rig so I need to go back a step and regenerate the rig. If I can load on my weight painting values that would save a lot of time.

Thanks for reading

Dan