I connect via ssh to my server, then I use mongo commands from terminal connected via ssh.
I do the backup with command “mongodump”:
sudo mongodump --db _objects --out /var/backups/mongo/
After I go to filezilla, and I download the backup to my computer, next I upload the backup to my new server, also with filezilla.
And then I run “mongorestore” from my new server via ssh terminal
sudo mongorestore --db _objects --drop /var/backups/mongo/_objects/
If you are using coronium take to account that you must upload files to lua folder, and after you must move them to the folder you want. Otherwise filezilla will not let you do it, and it will give you errors