What is disaster recovery?
When disaster strikes, your job as a SQL Server database administrator is to ensure business continuity by recovering the data estate to a previously known good state, in as short a time as possible. Disaster recovery is your organization's insurance policy and relies on support from the organization as well.
Note
A disaster is any event that causes an unplanned interruption in business continuity through unrecoverable failure.
At all times, remember that high availability is not disaster recovery. You're considering what happens when high availability could also fail, even if it makes use of the same underlying technology.
A good disaster recovery plan starts with a healthy database. You can make use of the maintenance features inside SQL Server, including maintenance plans with SQL Agent inside SQL Server Management Studio and Azure Data Studio, PowerShell cmdlets, from the command line using SQLCMD, and those provided by third parties...