I'm using Rsync to backup data to a remote server i pay for.

The script i'm running means i have to enter the password each time i want to run it.

is there anyway i can automate it so it can be ran via cron later on?

I don't have any access to the remote server as its not my own.

Thanks

Nowadays rsync default transfer protocol is ssh, hence you might setup public key authentication. Basically you have to create the private/public key pair on your local machine and copy the public key onto the remote server as $HOME/.ssh/authorized_keys. This is all explained in man ssh or in plenty of tutorials on-line, so I will not cover it here.

Two remarks only: if you don't have a direct ssh/scp access to the remote server, you can create the authorized_keys files in your local machine and rsync it to the remote server. Don't copy the public/private keys, only the authorized_keys file. The private key in particular must reside only on your local machine for the sake of security.

Second, once you have set-up the .ssh directory and the authorized_keys inside it with the proper permissions, you can use rsync like this:
where name_of_private_key is the default name of the generated key pair or the custom name you have chosen. Hope this helps.