There is no 'safest' way of doing this. FTP is one of the easiest protocols to circumvent. Simply put, your FTP username and password are always transmitted (together with any data you are transmitting) in the clear. They are not encrypted in any way. Therefore, an attacker is able to monitor ('sniff') your FTP transactions and retrieve your username and password. With this they can gain access to your data. I do not recommend you use a remote FTP site for storing important files.
Alternatives I would recommend are:
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