Backblaze B2 Backups
Due to the nice facility offred by having a multiple bucket system, nothing would be easier and more secure than doing a backblaze B2 Backup. Also because of the competitive pricing.
I asked BackBlaze whether they are working on adding support for Plesk. They are not. They support developers but do not develop third-party solutions in-house. I am not a developer so I cannot do this myself but I also came across their documentation for transfer of large files which requires python and some additional libraries. With both Mono and Python to choose from I am sure someone is capable of putting this together. Maybe someone at Plesk?
There is already an open source sample of how to easily add other Cloud Storages to Plesk as an Extension: https://github.com/plesk/ext-cloud-backup-example
Feel free to develop support for Backblaze and send it to the Plesk Team for certification and adding it to the Extension Catalog.
BackBlaze B2 Cloud Storage offers the first 10GB of storage free of charge. It would make an excellent repository for Plesk Backups. There are open source FTP clients such as Duplicati, based on the open source Mono framework. Hopefully the hard lift has already been done and someone can make the Plesk extension open source too. Giving Plesk users 10GB of free server backup would be a significant perk.
A must have option to backup Full Server / Selected Subscription to Backblaze B2 .. +1 Voted!