added comments

messagingpush/src/main/res/xml/backup_rules.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <full-backup-content>
-    <!-- Prevent EncryptedSharedPreferences file from being backed up -->
+    <!-- Encrypted preferences should not be backed up as the key used to encrypt it will no
+    longer be present when backup is restored -->
     <exclude
         domain="sharedpref"
-        path="io.customer.sdk.SECURE_PREFERENCE_FILE_KEY.xml" />
+        path="io.customer.sdk.EncryptedConfigCache.xml" />
 </full-backup-content>

sdk/src/main/java/io/customer/sdk/repository/preference/BasePreferenceRepository.kt

@@ -9,6 +9,8 @@ import android.content.SharedPreferences
 internal abstract class BasePreferenceRepository(val context: Context) {
 
     abstract val prefsName: String
+
+    // Making this abstract so base class has option to use encrypted shared prefs
     internal abstract val prefs: SharedPreferences
 
     // this would clear the prefs asynchronously

sdk/src/main/java/io/customer/sdk/repository/preference/SharedPreferenceRepository.kt

@@ -19,8 +19,13 @@ internal interface SharedPreferenceRepository {
 internal class SharedPreferenceRepositoryImp(context: Context) : SharedPreferenceRepository,
     BasePreferenceRepository(context) {
 
+    // The file name used for storing shared preferences.
+    // This preference file should not be included in Auto Backup.
+    // Upon restoration, the encryption key originally used may no longer be present.
+    // To prevent this, ensure the file name matches the one excluded in backup_rules.xml.
+    // Read more: https://developer.android.com/reference/androidx/security/crypto/EncryptedSharedPreferences
     override val prefsName: String by lazy {
-        "io.customer.sdk.SECURE_PREFERENCE_FILE_KEY"
+        "io.customer.sdk.EncryptedConfigCache"
     }
 
     override val prefs: SharedPreferences