How to erase a backup



Hi every one,
I’ve installed Kodi 21.0 on my LG tv WebOS 6.0 model UP78006LB and is working fine. The only problem is that by default backups are saved in the root of the system and I can’t access to such folder to erase an older backup.
Is there any workaround to erase it and keep in the system the last backup I did?
Many thanks in advance for your help.
fmas2