I wonder if you can set up a cron to send automatically a backup of my website to another hosting server via FTP
I made some tests, but I failed to work.
Has anyone tried this?
That should no be an issue, but you really have not provided enough information.
What fails? Is there an error message? Perhaps post the code of your script?
There are a few scripts out there, such as Dreamhost Snapshot (I believe it's called), which can be configured to backup to your 50GB backups user account at DH. Or are you trying to implement some sort of poor-man's colocation or failover system?