- Ensure you have selected an e-mail address for delivery of backup files in the setting "Email backups", and that the "What to backup" setting is set to "database"
Site experiencing issue
- From the screen Tools > Backups, select Backup Now
- Check the email in question
- Observe there is reference to a file attachment that does not exist
E-mail attachments are not generated. The e-mails are being generated fine, however the attachment of the relevant backup data is not working. The database size is about 360 kB.
This issue does not occur on other site's to which I have access.
This issue also occurs regardless of the setting for "What to backup". This issue also occurs after uninstalling the plugin and re-installing it using the Plugins directory.
The issue was not reported to have occurred previously by the website's owner. I noticed the issue after a recent update to version 1.6.2, after which the emails seemed to work, but the file size was too large to allow attachments. I later updated to version 1.6.3 to avoid a "duplicate headers" error, and have since noticed the issue. It is therefore entirely possible this occurred with previous versions of the plugin.
The backups appear to be generated on the site's webspace correctly - according to the Tools > Backups page and FTP directory listing, there are full backups being generated in the appropriate folder each time I select Backup Now. These are fully downloadable via FTP or the Tools > Backups page. These backups have not been tested to ensure they will successfully restore lost data.
The site in question has the "W3 Total Cache" plugin installed. If the user selects to clear its page cache after each deactivation and subsequent reactivation (as recommended by its warnings when activating or deactivating a plugin), the issue still occurs.