Just in case, anyone else is struggling with moving their Timeshift etc over to an SD card here are some instructions that I copied and pasted from here somewhere along the line:
SETTING UP A MICROSD CARD:
Switch off the box and insert Microsd
Power on
Menu > Setup > System > Storage Devices > Initialisation
Select microsd (should be named mmcblk0p1) and press red button to initialise.
Menu > Setup > System > Storage Devices > Convert ext3 filesystem to ext4
Select mmcblk0p1 and press red button to convert.
Menu > InfoPanel > Plugins > Mount Manager
Check microsd is mounted as /media/mmcblk0p1 and is Type: ext4 R/W
If not /media/mmcblk0p1 press green button 'Setup Mounts' highlight the microsd and change to /media/mmcblk0p1 using left/right buttons.
Reboot
SWAPFILE
Menu > InfoPanel > Plugins > Swap Manager
Delete existing swapfile on
HDD
Select microsd and click 'Create'
Wait about 15 minutes for this to complete and then click 'Autostart' and then 'Enable'Reboot
EPG
Menu > Setup > EPG
Go to settings and change location to /media/mmcblk0p1
Download new EPG via CrossEPG or EPG Importer
TIMESHIFT
Menu > Setup > Recordings & Timeshift > Timeshift Settings (Optional depending on size of microsd)
Timeshift location - Change to media/mmcblk0p1
PICONS
MENU > PLUGINS > RED BUTTON (remove plugins)
Remove previously installed feeds and picons.
Reboot
Menu > Plugins > Green button > Highlight feeds and press OK > Highlight picons.xyz and press OK > Press OK again
When you are back to the list of plugins Press exit and then press exit again.
Press and hold power button and select restart to restart the box.
When your box has restarted:
Press the Green button > Green button again > Picons > Press the OK button
Installing the feed will have unlocked some Picons that weren’t available before.
Scroll down the list to: srp-full.400x240-370x210.light.on.transparent Press OK > Press OK again. Select MicroSD and press OK.
This can take 10 or 15 minutes depending on your broadband speed.