diff --git a/src/main/java/ext/Ext.kt b/src/main/java/ext/Ext.kt
index db9ff96a..ced96103 100644
--- a/src/main/java/ext/Ext.kt
+++ b/src/main/java/ext/Ext.kt
@@ -2,6 +2,7 @@ package ext
 
 import com.fasterxml.jackson.core.JsonParser
 import com.fasterxml.jackson.databind.DeserializationContext
+import com.fasterxml.jackson.databind.DeserializationFeature
 import com.fasterxml.jackson.databind.JsonDeserializer
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.module.SimpleModule
@@ -19,6 +20,7 @@ import org.apache.tika.Tika
 import org.apache.tika.mime.MimeTypes
 import org.slf4j.LoggerFactory
 import org.springframework.http.HttpStatus
+import org.springframework.web.bind.annotation.PathVariable
 import org.springframework.web.bind.annotation.RequestBody
 import org.springframework.web.bind.annotation.RequestHeader
 import org.springframework.web.bind.annotation.RequestMapping
@@ -37,6 +39,7 @@ import kotlin.reflect.jvm.jvmErasure
 typealias RP = RequestParam
 typealias RB = RequestBody
 typealias RH = RequestHeader
+typealias PV = PathVariable
 typealias API = RequestMapping
 typealias Str = String
 typealias Bool = Boolean
@@ -83,7 +86,7 @@ fun Str.isValidEmail(): Bool = emailRegex.matches(this)
 val ACCEPTABLE_FALSE = setOf("0", "false", "no", "off", "False", "None", "null")
 val ACCEPTABLE_TRUE = setOf("1", "true", "yes", "on", "True")
 @Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN", "UNCHECKED_CAST")
-val jackson = ObjectMapper().apply {
+val JACKSON = ObjectMapper().apply {
     findAndRegisterModules()
     registerModule(SimpleModule().addDeserializer(Boolean::class.java, object : JsonDeserializer<Boolean>() {
         override fun deserialize(parser: JsonParser, context: DeserializationContext) = when(parser.text) {
@@ -103,7 +106,10 @@ val jackson = ObjectMapper().apply {
         override fun deserialize(parser: JsonParser, context: DeserializationContext) =
             parser.text.asDateTime() ?: (400 - "Invalid date time value ${parser.text}")
     }))
+    configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
 }
+inline fun <reified T> Str.parseJson() = JACKSON.readValue(this, T::class.java)
+fun <T> T.toJson() = JACKSON.writeValueAsString(this)
 @OptIn(ExperimentalSerializationApi::class)
 val JSON = Json {
     ignoreUnknownKeys = true
@@ -144,10 +150,12 @@ catch (e: Exception) { null } }
 fun Long.toHex(len: Int = 16): Str = "0x${this.toString(len).padStart(len, '0').uppercase()}"
 fun Map<String, Any>.toUrl() = entries.joinToString("&") { (k, v) -> "$k=$v" }
 
-// Map
+// Collections
 operator fun <K, V> Map<K, V>.plus(map: Map<K, V>) =
     (if (this is MutableMap) this else toMutableMap()).apply { putAll(map) }
 operator fun <K, V> MutableMap<K, V>.plusAssign(map: Map<K, V>) { putAll(map) }
+fun <T> MutableList<T>.popAll(list: List<T>) = list.also { removeAll(it) }
+fun <T> MutableList<T>.popAll(vararg items: T) = popAll(items.toList())
 
 // Strings
 operator fun Str.get(range: IntRange) = substring(range.first, (range.last + 1).coerceAtMost(length))
diff --git a/src/main/java/icu/samnyan/aqua/net/SettingsApi.kt b/src/main/java/icu/samnyan/aqua/net/SettingsApi.kt
index 94324ce3..f88a6860 100644
--- a/src/main/java/icu/samnyan/aqua/net/SettingsApi.kt
+++ b/src/main/java/icu/samnyan/aqua/net/SettingsApi.kt
@@ -40,14 +40,6 @@ class SettingsApi(
             userRepo.save(u.apply { gameOptions = it })
         }
         // Check field type
-//        val type = field.returnType
-//        val newValue = when (type.classifier) {
-//            String::class -> value
-//            Int::class -> value.toInt()
-//            Boolean::class -> value.toBoolean()
-//            else -> (400 - "Invalid field type $type")
-//        }
-//        field.set(options, newValue)
         field.setCast(options, value)
         goRepo.save(options)
     }
diff --git a/src/main/java/icu/samnyan/aqua/net/games/ImportController.kt b/src/main/java/icu/samnyan/aqua/net/games/ImportController.kt
index 3cfd54f2..f3dbc173 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/ImportController.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/ImportController.kt
@@ -1,6 +1,6 @@
 package icu.samnyan.aqua.net.games
 
-import ext.jackson
+import ext.JACKSON
 import ext.splitLines
 import java.lang.reflect.Field
 import kotlin.reflect.KClass
@@ -54,7 +54,7 @@ abstract class ImportController<T: Any>(
             lists[tb.name]?.add(obj) ?: field.set(data, obj)
         }
 
-        return ImportResult(errors, warnings, jackson.writeValueAsString(data))
+        return ImportResult(errors, warnings, JACKSON.writeValueAsString(data))
     }
 
     companion object
@@ -69,7 +69,7 @@ abstract class ImportController<T: Any>(
             // Process Nones
             dict = dict.filterValues { it != "None" }
 
-            return jackson.convertValue(dict, type.java)
+            return JACKSON.convertValue(dict, type.java)
         }
     }
 }
diff --git a/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt b/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
index ebe32ebd..ba130a51 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
@@ -1,13 +1,14 @@
 package icu.samnyan.aqua.net.games.chu3
 
+import ext.API
 import icu.samnyan.aqua.api.model.resp.sega.chuni.v2.external.Chu3DataExport
 import icu.samnyan.aqua.net.games.ImportClass
 import icu.samnyan.aqua.net.games.ImportController
 import icu.samnyan.aqua.sega.chusan.model.userdata.*
-import kotlin.io.path.Path
-import kotlin.io.path.readText
-
+import org.springframework.web.bind.annotation.RestController
 
+@RestController
+@API("api/v2/game/chu3")
 class Chu3Import : ImportController<Chu3DataExport>(
     exportFields = Chu3DataExport::class.java.declaredFields.associateBy {
         var name = it.name
@@ -34,8 +35,4 @@ class Chu3Import : ImportController<Chu3DataExport>(
 ) {
     override fun createEmpty() = Chu3DataExport("SDEZ", UserData(), UserGameOption(), ArrayList(), ArrayList(),
         ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList())
-}
-
-fun main() {
-    Chu3Import().importArtemisSql(Path("C:\\Users\\Azalea\\Downloads\\all_inserts (2).sql").readText())
 }
\ No newline at end of file
diff --git a/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt b/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
index 2a17c058..0d742db5 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
@@ -1,10 +1,14 @@
 package icu.samnyan.aqua.net.games.mai2
 
+import ext.API
 import icu.samnyan.aqua.api.model.resp.sega.maimai2.external.Maimai2DataExport
 import icu.samnyan.aqua.net.games.ImportClass
 import icu.samnyan.aqua.net.games.ImportController
 import icu.samnyan.aqua.sega.maimai2.model.userdata.*
+import org.springframework.web.bind.annotation.RestController
 
+@RestController
+@API("api/v2/game/mai2")
 class Mai2Import : ImportController<Maimai2DataExport>(
     exportFields = Maimai2DataExport::class.java.declaredFields.associateBy {
         it.name.replace("List", "").lowercase()
diff --git a/src/main/java/icu/samnyan/aqua/net/games/mai2/Maimai2.kt b/src/main/java/icu/samnyan/aqua/net/games/mai2/Maimai2.kt
index 5f189084..e031ba4d 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/mai2/Maimai2.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/mai2/Maimai2.kt
@@ -2,6 +2,7 @@ package icu.samnyan.aqua.net.games.mai2
 
 import ext.*
 import icu.samnyan.aqua.api.model.resp.sega.maimai2.external.Maimai2DataExport
+import icu.samnyan.aqua.net.db.AquaNetUser
 import icu.samnyan.aqua.net.db.AquaUserServices
 import icu.samnyan.aqua.net.games.*
 import icu.samnyan.aqua.net.utils.*
@@ -9,7 +10,10 @@ import icu.samnyan.aqua.sega.maimai2.model.*
 import icu.samnyan.aqua.sega.maimai2.model.userdata.UserDetail
 import org.springframework.web.bind.annotation.RestController
 import java.lang.reflect.Field
+import java.time.LocalDateTime
 import java.util.*
+import kotlin.io.path.Path
+import kotlin.io.path.writeText
 import kotlin.reflect.full.declaredMembers
 
 @RestController
@@ -19,7 +23,8 @@ class Maimai2(
     override val playlogRepo: Mai2UserPlaylogRepo,
     override val userDataRepo: Mai2UserDataRepo,
     val userGeneralDataRepository: Mai2UserGeneralDataRepo,
-    val repos: Mai2Repos
+    val repos: Mai2Repos,
+    val netProps: AquaNetProps
 ): GameApiController<UserDetail>("mai2", UserDetail::class) {
     override suspend fun trend(@RP username: Str): List<TrendOut> = us.cardByName(username) { card ->
         findTrend(playlogRepo.findByUserCardExtId(card.extId)
@@ -49,23 +54,40 @@ class Maimai2(
     // Use reflection to get all properties in Mai2Repos with matching names in Maimai2DataExport
     val exportFields: Map<Field, UserLinked<*>> = listOf(*Maimai2DataExport::class.java.declaredFields)
         .associateWith { Mai2Repos::class.declaredMembers
+            .filter { f -> f.name !in setOf("gameId", "userData") }
             .filter { f -> f returns UserLinked::class }
             .firstOrNull { f -> f.name == it.name || f.name == it.name.replace("List", "") }
             ?.call(repos) as UserLinked<*>? ?: error("No matching field found for ${it.name}")
         }
 
+    fun export(u: AquaNetUser) = Maimai2DataExport().apply {
+        gameId = "SDEZ"
+        userData = repos.userData.findByCard(u.ghostCard) ?: (404 - "User not found")
+        exportFields.forEach { (f, u) ->
+            if (f.name == "gameId" || f.name == "userData") return@forEach
+            f.set(this, if (f.type == List::class.java) u.findByUser(userData)
+            else u.findSingleByUser(userData).orElse(null))
+        }
+    }
+
     @API("export")
-    fun exportAllUserData(@RP token: Str) = us.jwt.auth(token) { u ->
-        try {
-            Maimai2DataExport().apply {
-                gameId = "SDEZ"
-                userData = repos.userData.findByCard(u.ghostCard) ?: (404 - "User not found")
-                exportFields.forEach { (f, u) ->
-                    if (f.name == "gameId" || f.name == "userData") return@forEach
-                    f.set(this, if (f.type == List::class.java) u.findByUser(userData)
-                        else u.findSingleByUser(userData).orElse(null))
-                }
-            }
-        } catch (e: Exception) { 500 - "Error during data export. Reason: ${e.message}" }
+    fun exportAllUserData(@RP token: Str) = us.jwt.auth(token) { u -> export(u) }
+
+    @API("import")
+    fun importUserData(@RP token: Str, @RP json: Str) = us.jwt.auth(token) { u ->
+        val export = json.parseJson<Maimai2DataExport>()
+        if (!export.gameId.equals("SDEZ", true)) 400 - "Invalid game ID"
+
+        // Check existing data
+        if (repos.userData.findByCard(u.ghostCard) != null) {
+            // Store a backup of the old data
+            val fl = "mai2-backup-${u.auId}-${LocalDateTime.now().isoDateTime()}.json"
+            (Path(netProps.importBackupPath) / fl).writeText(export(u).toJson())
+
+            // Delete the old data
+            TODO()
+        }
+
+        TODO()
     }
 }
\ No newline at end of file
diff --git a/src/main/java/icu/samnyan/aqua/net/utils/AquaNetProps.kt b/src/main/java/icu/samnyan/aqua/net/utils/AquaNetProps.kt
index b2fcd328..fc2f5854 100644
--- a/src/main/java/icu/samnyan/aqua/net/utils/AquaNetProps.kt
+++ b/src/main/java/icu/samnyan/aqua/net/utils/AquaNetProps.kt
@@ -7,4 +7,5 @@ import org.springframework.context.annotation.Configuration
 @ConfigurationProperties(prefix = "aqua-net")
 class AquaNetProps {
     var linkCardLimit: Int = 10
+    var importBackupPath = "data/import-backups"
 }
\ No newline at end of file