Thanks everyone for your inputs
It turns out I have RAID on the server and the disc is mirrored to a second disc should the first disc fail.
I've also installed JetBackup on the server for cPanel account backups, locally.
And using WHM I have a daily system back up cron which is stored remotely on Google Drive, just in case, and so far using compression it falls within their free 15Gb limit.
I've ditched AWS (Amazon S3) as unnecessary now.