Check Plesk backups
If you have a Plesk server, and you’re considering upgrading because you’ve ran out of space, I would first recommend checking the Plesk backups saved on your server. If they are consuming too much space, you should adjust the backup schedule and delete older backups.
Plesk Global Backup Settings:
https://docs.plesk.com/en-US/obsidian/administrator-guide/backing-up-and-restoration/global-backup-settings.59265/
Removing Backup Files from Server:
https://docs.plesk.com/en-US/obsidian/administrator-guide/backing-up-and-restoration/removing-backup-files-from-server.59262/
If you’ve maxed out on disk space and are unable to login to Plesk, you will have to remove them through SSH or Command Prompt:
https://support.plesk.com/hc/en-us/articles/12377452798359–How-to-remove-Plesk-backup-files-and-their-logs
Delete snapshot and shut down server
Login to the IONOS control panel ( https://id.ionos.com ), then go to Menu > Servers & Cloud, choose your server contract (if you have multiple), go to Infrastructure > Servers, click on your server, Actions > Delete Snapshot.
Shut down the server: Actions > Shut Down.
Customize the server: Actions > Customize. Here you can upgrade your server for more disk space, RAM, and CPU.
Enlarge the SSD within the server
After upgrading, you would then need to enlarge the SSD using logical volume management:
Customizing a Logical Volume After Enlarging an SSD in Ubuntu/Debian (Cloud Server)
https://www.ionos.com/help/index.php?id=4315
Adjust Logical Volume after SSD has been Enlarged; Applies to Microsoft Windows Server 2019 or Server 2022 (Cloud Server)
https://www.ionos.com/help/index.php?id=4835
Customizing the Logical Volume After Enlarging the SSD in CentOS (Cloud Server)
https://www.ionos.com/help/index.php?id=4314