In TWRP → Backup → Select System, Data, Boot → Save to external SD card or OTG USB.
Repartitioning the Xiaomi Pad 6 (or similar devices) is generally not recommended for casual users. The 128GB/256GB storage is sufficient for most standard ROMs. If you are attempting this to bypass storage limitations for a specific port, ensure you have a "EDL Cable" (Emergency Download) available as a fail-safe recovery method. repartitionmipad12gbzardmi3zip
When flashing Android 8.1/9.0 GSI or custom ROMs, the system image may require 1.5GB+. Attempting to flash fails with “Insufficient storage” in TWRP. Resizing system from 1.2GB to 1.8GB or 2GB forces you to shrink userdata – hence the “12GB available” concept. In TWRP → Backup → Select System, Data,