How to Upload Backup Files to Server from your Computer in Plesk Control Panel?
This upload option can be used to upload a backup file from your computer to serve in backup server.
Step 1: Login to Plesk Control Panel
Step 2: Under Websites and Domains, click Backup Manager
Step 3: Click Upload Option as shown in the image.
Step 4: Choose the file you need to upload. If you need password protection, you can enable password protection and enter the password. Click OK.
Your files are backuped now.