Connect your Vita to a PC via VitaShell and copy the data , Overlay , and ROMs folders to the root of your ux0: partition.
: To update the RetroArch version without losing craZyMac's settings, you should generally only replace the VPK and specifically selected core files, as documented in community update guides on Reddit . Mega version? Ps.vita.retro.ultimate.lite.version.3.0-crazymac
: You need at least 21GB of free space on your memory card or SD2Vita adapter. Connect your Vita to a PC via VitaShell