How to restore the backup for certain subscription/domain in Plesk?
Login to Plesk under admin user
Go to Subscriptions > example.com > Backup Manager and click on a required backup from the list. The backups of the subscription created during full server backup will be displayed here as well:
Restoring of the required domain/site is also possible in Tools & Settings > Backup Manager using the selective restore: Backup Manager allows choosing between Type of object to restore: mail accounts, databases, certificates, sites configuration, files of domains. Use Sites option to restore a certain subscription: Or, by specifying Files option and selecting 'httpdocs' folder, full domain's content will be restored. Also it is possible to restore only specific files by selecting them.