moving RootFS will format the target device. So not a good idea 
https://dietpi.com/forum/t/services-failing-after-swapping-backup-drives/3869/6
you could try to remove these cache files to gain space on your SD card.
moving RootFS will format the target device. So not a good idea https://dietpi.com/forum/t/services-failing-after-swapping-backup-drives/3869/6
you could try to remove these cache files to gain space on your SD card.