Hi,
for backups exported to an external storage such as AWS S3, could you start uploading in parallel you continue creating the zip files instead of waiting for all zip files to be created?
thanks
This idea was posted in UpdraftPlus - backup/restore plugin and tagged backup, speed on July 20, 2021 by 
JACQUES RANCOURT.
The zipping seems to take relatively little time in comparison to the uploading part. Implementing multi-threaded uploading either using curl multi (https://www.php.net/manual/en/function.curl-multi-init.php), or the ability to specify an external binary such as the Backblaze cli tool (https://www.backblaze.com/b2/docs/quick_command_line.html#download) would deliver a significant improvement to speed.
For example, an 18gb backup is currently taking > 12 hours to upload to Backblaze through updraft plus. I can upload (and have tested) uploading the same files using the Backblaze cli, and it takes < 10 minutes! I have also experienced this with AWS S3 in the past.
This has been implemented. Thank you for the idea!