The search index could not be updated. The site is misconfigured. Contact an administrator. SQLSTATE[42000]: Syntax error or access violation: 1064 unknown table 'tiki_main_67e2559f7089d' in delete request
The backup page does not work indeed, so don't use it.
I don't know how your ISP makes backups, but it's possible that will work.
I use the export feature in phpMyAdmin to make backups of tikiwiki.
