Zoho backup is small and corrupted

Zoho backup is small and corrupted

Hello,

I usually backup my Zoho wiki once a week using the link that is in the wiki menu under Settings >> General >> Backup. However, today the backup is only 66K when it is usually a little over one MB. When I try to extract the zip file, it says the file is corrupt and cannot be extracted.

Is this a known problem?

Thanks for your time,