to check all I have to do is change the background and reboot, see if the change stuck?
If you get to the command prompt and type
df
, you should see:
Filesystem 1K-blocks Used Available Use% Mounted on
aufs 891840 115888 730648 14% /
tmpfs 1030368 0 1030368 0% /lib/init/rw
udev 1022256 64 1022192 1% /dev
tmpfs 1030368 4 1030364 1% /dev/shm
/dev/sda1 1046464 707056 339408 68% /live/image
/dev/sda2 891840 115888 730648 14% /live/cow
tmpfs 1030368 0 1030368 0% /live
tmpfs 1030368 244 1030124 1% /tmp
or something similar. Providing /dev/sda2 is mounted on /live/cow and not /media/somethingorother, you should be absolutely good to go.
Cheers,
Niccy.