Support

You will need the following setup:

An SSH server must be installed on the remote server, i.e. where the backup archives will be sent. Reading your ticket I understand this is already the case.

The SSH2 PHP module must be installed and activated on the source server, i.e. where the site to be backed up currently lives. This is what you are missing. The SSH2 PHP module is actually very stable and can be activated safely. Please ask your host to do that.

Note: even though there are pure PHP alternatives to the SSH2 PHP module they are abysmally slow and completely unfit for trnasfering large files such as backup archives. If we'd choose to use that you'd have to split your archives to 1Mb parts (meaning that each backup would be dozens to thousands of files) and the transfer would take MUCH longer (typically: hours) making it completely unpractical. If your host cannot enable the SSH2 PHP module I'd recommend using FTPS (FTP over SSL) which is a secure file transfer method. I would never recommend using plain FTP as the credentials (username & password) are transferred unencrypted, a patently bad idea for file transfers over the open Internet – that's why I would only recommend plain, unencrypted FTP only for transfers within the same host, as they are likely to be routed solely through their network, drastically reducing the chances of a man in the middle attack.