Snapshots and backups
Two different safety nets. Most people need both.
Snapshots protect against mistakes
A snapshot freezes your server's exact state in a moment. Taking one is instant, and rolling back to it is nearly instant. You get three per server, free.
Take one before anything you would not want to undo by hand: an app upgrade, a configuration change, following a tutorial you are not sure about.
Snapshots live on the same disk as your server. They will not save you from a hardware failure — that is what backups are for.
Backups protect against disasters
Daily backups are a paid add-on. They are full copies of your server, taken every night and stored on separate hardware. They cover the situations snapshots cannot: disk failure, ransomware, or deleting something important and not noticing for a fortnight.
Contact support to restore one.
Neither replaces exporting your own data
If your server holds something irreplaceable — a Minecraft world you have played for two years, your only copy of the family photos — keep a copy somewhere that is not us. Every app page below explains where that app keeps its data.