Your concern makes sense.
I've just updated the ExtendPersistentImg.sh script on the official website and added a free space check before the extension process.
Currently, you have a 32GB persistence file. When you run out of free space again, simply run the script once more to extend it by another 32GB (for example).
Once your USB drive is completely full, if you run the script again to try extending by an additional 32GB, it will automatically prompt that there is insufficient free space.
I've just updated the ExtendPersistentImg.sh script on the official website and added a free space check before the extension process.
Currently, you have a 32GB persistence file. When you run out of free space again, simply run the script once more to extend it by another 32GB (for example).
Once your USB drive is completely full, if you run the script again to try extending by an additional 32GB, it will automatically prompt that there is insufficient free space.