In reply to AndyRoss:
> Is there a way to enable keeping the crag data on the SD card rather than internal storage... This is on Android, Sony Xperia XZ1 in case that's useful.
Word of caution: I don't know about the XZ1, but Xperia phones have in the past had a bug that stopped them updating apps if the data was on the SD card. Annoyingly, the app update just failed without telling you why. Even more annoying was if, when you migrated the data back to internal memory, there wasn't enough internal memory left to do the upgrade. Ask me how I know. Grr...
You might want to read around online e.g. the Sony user support forums to see if that fault also affects the XZ1.