Support backup to Google Cloud Storage
Similar to Amazon S3 extension just for Google Cloud Storage

At the moment we have no plans for Google Cloud Storage extension. We are sure that already existing cloud backup extensions are enough. For example, Google Drive - https://ext.plesk.com/packages/52fd6315-22a4-48b8-959d-b2f1fd737d11-google-drive-backup Also, we have open SDK and you can write your own extension for Google Cloud Storage. -- IG
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Elias commented
If your Plesk server is hosted on a cloud platform other than AWS (such as Google Cloud, Vultr, or DigitalOcean), using Amazon S3 for backups will result in additional network data transfer costs
Additional
When your Plesk server and your storage solution are on the same cloud platform (like Google Cloud), data transfer occurs over Google's high-speed internal network. This offers two critical advantages:
Faster Backups: Backups complete more quickly because the data doesn't have to travel over the public internet to a different provider. This reduces the time your server is under load during the backup process.
Faster Restores: More importantly, in a disaster recovery scenario, you can restore your data and websites significantly faster. Pulling terabytes of data back from a different cloud provider can be slow and expensive, increasing your downtime. Keeping backups within the same ecosystem ensures the quickest possible recovery time when you need it most.