Knoppix Persistent USB; Once you have successfully booted from your Knoppix USB flash drive, you might find that there are changes you would like to make and settings you need to adjust. After getting everything the way you want it, you will need to save your changed settings back to the stick and have them automatically applied at boot.
Saving changes – Persistence
How to use a persistent image to save your settings and changes
SLAX Save Changes & Restore Changes; Once you have accomplished a successful boot of SLAX Linux and have begun to make changes and customizations to the SLAX environment, you might wish to save those configuration settings back to the USB stick. This will allow you to restore those changes upon next reboot.