As you can imagine, that is a BIG chunk out of my 6GB total!
I have flashed lots of ROMs in the last couple of weeks but I have now settled on one. AFAIK all I need to keep is the current bakup in TWRP in case anything happens.
I would be glad for some advice as to what I can safely delete. I don't want to make a mistake as my system is running brilliantly right now.
Many thanks for any help!