Even if your website hosting company says they are performing backups of your website it is an Internet Marketing Best Practice to have your own backup and disaster recovery system in place.
Hostgator, GoDaddy, Network Solutions, or other hosting companies may tell you they backup your website, but don’t be shocked to find out that in the event of a disaster your website cannot be restored properly, or in a timely manner.
Unfortunately, I’ve seen this happen too many times.
Review your hosting company’s terms of service and you’ll find you have very little recourse.
Resources (for WordPress websites)
iThemes Backup Buddy https://ithemes.com/purchase/backupbuddy/
UpDraft (free and premium) https://updraftplus.com/
VaultPress / JetPack https://vaultpress.com/
Recommended High-Performance Website Hosting: https://siteground.com