Please check again! My site is down! it is giving 404 error because of the All 404 Redirect to Homepage plugin. The reason for the error is because of the plugin All 404 Redirect to Homepage and hence you might need to check with the plugin provider or developer for the issue .However, for disk space could see that old files has been kept .
All 404 Redirect to Homepage has detected that the target URL is invalid, this will cause an infinite loop redirection, please go to the plugin settings and correct the traget link!”