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As a general advice, you should periodically run backups of your site, so that in the event that you face an attack or shutdown you still have a copy of your data. This copy will enable you to restore the application in another instance if needed. Here you have two marvelous guides that cover the topic of backups in WordPress:
Also, you may ensure that the backups are also stored in another place different that your running server, so that if it compromised you don't have a single point of failure.
Use SSH secure connections in order to communicate with your server. E.g. if you require to upload files for your server do so by using SFTP:
Secure your WordPress instance by using Wordfence:
Also, do not reveal your credentials to anyone and keep them secure so that they are not easy to guess.
Jose Antonio Carmona
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