So, the wiki has this statement under Backing Up Settings:
" Under My OSMC’s backup wizard, you can also configure a backup schedule."
So, I have looked everywhere under the backup wizard and I cannot find where I can configure a backup schedule. I can configure an update check schedule, but see nothing about a backup schedule. Is the wiki correct, and if so, where is this done! Which screen? All I can find is manual which i did.
Did you enable the option for “backup before each update” and also reboot after configuring these options. There seems to be a bug at present that the new settings only get applied after Kodi restarts.