apparently that screenshot from the help file that shows the Move option is an old one and that option for Mac and Linux has been removed. Although, there is a task to reimplement it. I'm certain the removal was an engineering necessity at the time.
The support team has provided the following directions if you want to move the database manually. I won't be able to provide much support to you here if you have questions about the steps but feel free to reply here or open a support case directly. If you do open to support case, please reference this forum post. Here are the instructions:
1) Stop backup service:
##### For RedHat 6, CentOS 6, Ubuntu 12-14, Amazon Linux standalone v 2.* #####
sudo service cloudberry-backup stop
##### For RedHat 7, CentOS 7, Ubuntu 16-18 standalone v 2.* #####
sudo systemctl stop cloudberry-backup.service
2) Move cbbackup.db, cbbackup.db-wal, cbbackup.db-shm from /opt/local/Online\ Backup/00000000-0000-0000-0000-000000000000/config/ folder to another folder on a local disk.
3) Create symlinks for these 3 files to an original location.
4) Start backup service:
##### For RedHat 6, CentOS 6, Ubuntu 12-14, Amazon Linux standalone v 2.* #####
sudo service cloudberry-backup start
##### For RedHat 7, CentOS 7, Ubuntu 16-18 standalone v 2.* #####
sudo systemctl start cloudberry-backup.service