Troubleshooting
# Unable to delete Packages
Try deleting packages one by one.
# Interrupt in Build Package – no timeout
On SiteGround hosting servers add to htaccess:
<IfModule mod_security.c> SecFilterRemove 001838 </IfModule>
Source: https://wordpress.org/support/topic/interrupt-in-build-package/
# Undefined error during backup creation
Add folder and plugin filters, especially for caching and security plugins (e.g. /plugins/wordfence/lib).
# Binary Code in installer.php file
Download dirctly from snapshots folder. Probably the web server is trying to change the mime type.
# Serializaton Error
Make sure wp-config is inside the package (not just a redirect).