diff --git a/src/rime/lever/deployment_tasks.cc b/src/rime/lever/deployment_tasks.cc
index 1431eab11..ec8f5ca93 100644
--- a/src/rime/lever/deployment_tasks.cc
+++ b/src/rime/lever/deployment_tasks.cc
@@ -251,55 +251,66 @@ SchemaUpdate::SchemaUpdate(TaskInitializer arg) : verbose_(false) {
   }
 }
 
-static bool IsCustomizedCopy(const string& file_name);
+static bool MaybeCreateDirectory(fs::path dir) {
+  if (!fs::exists(dir)) {
+    boost::system::error_code ec;
+    if (!fs::create_directories(dir, ec)) {
+      LOG(ERROR) << "error creating directory '" << dir.string() << "'.";
+      return false;
+    }
+  }
+  return true;
+}
 
-static bool TrashCustomizedCopy(const fs::path& shared_copy,
-                                const fs::path& user_copy,
-                                const string& version_key,
-                                const fs::path& trash) {
+static bool RemoveVersionSuffix(string* version, const string& suffix) {
+    size_t suffix_pos = version->find(suffix);
+    if (suffix_pos != string::npos) {
+      version->erase(suffix_pos);
+      return true;
+    }
+    return false;
+}
+
+static bool TrashDeprecatedUserCopy(const fs::path& shared_copy,
+                                    const fs::path& user_copy,
+                                    const string& version_key,
+                                    const fs::path& trash) {
   if (!fs::exists(shared_copy) ||
       !fs::exists(user_copy) ||
       fs::equivalent(shared_copy, user_copy)) {
     return false;
   }
-  if (IsCustomizedCopy(user_copy.string())) {
-    string shared_copy_version;
-    string user_copy_version;
-    Config shared_config;
-    if (shared_config.LoadFromFile(shared_copy.string())) {
-      shared_config.GetString(version_key, &shared_copy_version);
-    }
-    Config user_config;
-    if (user_config.LoadFromFile(user_copy.string()) &&
-        user_config.GetString(version_key, &user_copy_version)) {
-      size_t custom_version_suffix = user_copy_version.find(".custom.");
-      if (custom_version_suffix != string::npos) {
-        user_copy_version.erase(custom_version_suffix);
-      }
-    }
-    if (CompareVersionString(shared_copy_version, user_copy_version) >= 0) {
-      fs::path backup = trash / user_copy.filename();
-      boost::system::error_code ec;
-      fs::rename(user_copy, backup, ec);
-      if (ec) {
-        LOG(ERROR) << "error trashing file " << user_copy.string();
-        return false;
-      }
-      return true;
+  string shared_copy_version;
+  string user_copy_version;
+  Config shared_config;
+  if (shared_config.LoadFromFile(shared_copy.string())) {
+    shared_config.GetString(version_key, &shared_copy_version);
+    // treat "X.Y.minimal" as equal to (not greater than) "X.Y"
+    // to avoid trashing the user installed full version
+    RemoveVersionSuffix(&shared_copy_version, ".minimal");
+  }
+  Config user_config;
+  bool is_customized_user_copy =
+      user_config.LoadFromFile(user_copy.string()) &&
+      user_config.GetString(version_key, &user_copy_version) &&
+      RemoveVersionSuffix(&user_copy_version, ".custom.");
+  int cmp = CompareVersionString(shared_copy_version, user_copy_version);
+  // rime-installed user copy of the same version should be kept for integrity.
+  // also it could have been manually edited by user.
+  if (cmp > 0 || (cmp == 0 && is_customized_user_copy)) {
+    if (!MaybeCreateDirectory(trash)) {
+      return false;
     }
-  }
-  return false;
-}
-
-static bool MaybeCreateDirectory(fs::path dir) {
-  if (!fs::exists(dir)) {
+    fs::path backup = trash / user_copy.filename();
     boost::system::error_code ec;
-    if (!fs::create_directories(dir, ec)) {
-      LOG(ERROR) << "error creating directory '" << dir.string() << "'.";
+    fs::rename(user_copy, backup, ec);
+    if (ec) {
+      LOG(ERROR) << "error trashing file " << user_copy.string();
       return false;
     }
+    return true;
   }
-  return true;
+  return false;
 }
 
 bool SchemaUpdate::Run(Deployer* deployer) {
@@ -416,10 +427,10 @@ bool ConfigFileUpdate::Run(Deployer* deployer) {
   fs::path source_config_path(shared_data_path / file_name_);
   fs::path dest_config_path(user_data_path / file_name_);
   fs::path trash = user_data_path / "trash";
-  if (TrashCustomizedCopy(source_config_path,
-                          dest_config_path,
-                          version_key_,
-                          trash)) {
+  if (TrashDeprecatedUserCopy(source_config_path,
+                              dest_config_path,
+                              version_key_,
+                              trash)) {
     LOG(INFO) << "deprecated user copy of '" << file_name_
               << "' is moved to " << trash;
   }
@@ -523,13 +534,8 @@ bool BackupConfigFiles::Run(Deployer* deployer) {
   if (!fs::exists(user_data_path))
     return false;
   fs::path backup_dir(deployer->user_data_sync_dir());
-  if (!fs::exists(backup_dir)) {
-    boost::system::error_code ec;
-    if (!fs::create_directories(backup_dir, ec)) {
-      LOG(ERROR) << "error creating directory '"
-                 << backup_dir.string() << "'.";
-      return false;
-    }
+  if (!MaybeCreateDirectory(backup_dir)) {
+    return false;
   }
   int success = 0, failure = 0, latest = 0, skipped = 0;
   for (fs::directory_iterator iter(user_data_path), end;
@@ -587,12 +593,8 @@ bool CleanupTrash::Run(Deployer* deployer) {
         boost::ends_with(filename, ".reverse.kct") ||
         boost::ends_with(filename, ".userdb.kct.old") ||
         boost::ends_with(filename, ".userdb.kct.snapshot")) {
-      if (!success && !failure && !fs::exists(trash)) {
-        boost::system::error_code ec;
-        if (!fs::create_directories(trash, ec)) {
-          LOG(ERROR) << "error creating directory '" << trash.string() << "'.";
-          return false;
-        }
+      if (!success && !MaybeCreateDirectory(trash)) {
+        return false;
       }
       fs::path backup = trash / entry.filename();
       boost::system::error_code ec;