Add project files.

SqliteBackups/BackupRoutines.cs

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+using SqliteBackups.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Data.SQLite;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SqliteBackups
+{
+    public class BackupRoutines : IBackupRoutines
+    {
+        public void BackupSqliteDb(string fromDb, string toDb)
+        {
+            using var source = new SQLiteConnection($"Data Source={fromDb}; Version=3;");
+            using var destination = new SQLiteConnection($"Data Source={toDb}; Version=3;");
+            source.Open();
+            destination.Open();
+            source.BackupDatabase(destination, "main", "main", -1, null, 0);
+        }
+    }
+}

SqliteBackups/Interfaces/IBackupRoutines.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SqliteBackups.Interfaces
+{
+    public interface IBackupRoutines
+    {
+        void BackupSqliteDb(string fromDb, string toDb);
+    }
+}

SqliteBackups/SqliteBackups.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Data.SQLite" Version="1.0.113.7" />
+  </ItemGroup>
+
+</Project>