Feature: Automatic Profile & Settings backup

Source/NETworkManager.Localization/Resources/Strings.resx

@@ -3951,4 +3951,13 @@ If you click Cancel, the profile file will remain unencrypted.</value>
   <data name="CouldNotParseX" xml:space="preserve">
     <value>Could not parse "{0}".</value>
   </data>
+  <data name="MaximumNumberOfBackups" xml:space="preserve">
+    <value>Maximum number of backups</value>
+  </data>
+  <data name="CreateDailyBackup" xml:space="preserve">
+    <value>Create daily backup</value>
+  </data>
+  <data name="HelpMessage_MaximumNumberOfBackups" xml:space="preserve">
+    <value>Number of backups that are retained before the oldest one is deleted.</value>
+  </data>
 </root>

Source/NETworkManager.Models/Network/NetworkInterface.cs

@@ -527,7 +527,6 @@ private static void RemoveIPAddressFromNetworkInterface(NetworkInterfaceConfig c
 
     #endregion
 
-
     #region Events
 
     /// <summary>

Source/NETworkManager.Profiles/GroupInfo.cs

@@ -311,4 +311,4 @@ public GroupInfo(GroupInfo group) : this(group.Name)
     [XmlIgnore] public SecureString SNMP_Auth { get; set; }
     public SNMPV3PrivacyProvider SNMP_PrivacyProvider { get; set; } = GlobalStaticConfiguration.SNMP_PrivacyProvider;
     [XmlIgnore] public SecureString SNMP_Priv { get; set; }
-}
+}

Source/NETworkManager.Profiles/GroupInfoSerializable.cs

@@ -10,6 +10,7 @@ public GroupInfoSerializable()
 
     public GroupInfoSerializable(GroupInfo profileGroup) : base(profileGroup)
     {
+
     }
 
     /// <summary>

Source/NETworkManager.Profiles/ProfileFileData.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
+
+namespace NETworkManager.Profiles;
+
+/// <summary>
+/// Represents the data structure for a profile file, including versioning, backup information, and groups of profiles.
+/// </summary>
+/// <remarks>This class supports property change notification through the <see cref="INotifyPropertyChanged"/>
+/// interface, allowing consumers to track changes to its properties. The <see cref="ProfilesChanged"/> property
+/// indicates whether the data has been modified since it was last saved, but is not persisted when serializing the
+/// object. Use this class to manage and persist user profile data, including handling schema migrations via the <see
+/// cref="Version"/> property.</remarks>
+public class ProfileFileData : INotifyPropertyChanged
+{
+    /// <summary>
+    ///     Occurs when a property value changes.
+    /// </summary>
+    public event PropertyChangedEventHandler PropertyChanged;
+
+    /// <summary>
+    ///     Helper method to raise the <see cref="PropertyChanged" /> event and mark data as changed.
+    /// </summary>
+    /// <param name="propertyName">Name of the property that changed.</param>
+    private void OnPropertyChanged([CallerMemberName] string propertyName = null)
+    {
+        ProfilesChanged = true;
+
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+
+    /// <summary>
+    ///     Indicates if the profile file data has been modified and needs to be saved.
+    ///     This is not serialized to the file.
+    /// </summary>
+    [JsonIgnore]
+    public bool ProfilesChanged { get; set; }
+
+    private int _version = 1;
+
+    /// <summary>
+    ///     Schema version for handling future migrations.
+    /// </summary>
+    public int Version
+    {
+        get => _version;
+        set
+        {
+            if (value == _version)
+                return;
+
+            _version = value;
+            OnPropertyChanged();
+        }
+    }
+
+    private DateTime? _lastBackup;
+
+    /// <summary>
+    ///     Date of the last backup (used for daily backup tracking).
+    /// </summary>
+    public DateTime? LastBackup
+    {
+        get => _lastBackup;
+        set
+        {
+            if (value == _lastBackup)
+                return;
+
+            _lastBackup = value;
+            OnPropertyChanged();
+        }
+    }
+
+    /// <summary>
+    ///     List of groups containing profiles.
+    /// </summary>
+    public List<GroupInfoSerializable> Groups { get; set; } = [];
+}