Standardize CT update backup handling (#15937)

ct/homelable.sh

@@ -35,16 +35,12 @@ function update_script() {
     systemctl stop homelable
     msg_ok "Stopped Service"
 
-    msg_info "Backing up Configuration and Data"
-    cp /opt/homelable/backend/.env /opt/homelable.env.bak
-    cp -r /opt/homelable/data /opt/homelable_data_bak
-    if [[ -f /opt/homelable/mcp/.env ]]; then
-      cp -a /opt/homelable/mcp/.env /opt/homelable-mcp.env.bak
-    fi
-    msg_ok "Backed up Configuration and Data"
+    create_backup /opt/homelable/backend/.env /opt/homelable/data /opt/homelable/mcp/.env
 
     CLEAN_INSTALL=1 fetch_and_deploy_gh_release "homelable" "Pouzor/homelable" "tarball" "latest" "/opt/homelable"
 
+    restore_backup
+
     msg_info "Updating Python Dependencies"
     cd /opt/homelable/backend
     $STD uv venv --clear /opt/homelable/backend/.venv
@@ -57,17 +53,8 @@ function update_script() {
     $STD npm run build
     msg_ok "Rebuilt Frontend"
 
-    msg_info "Restoring Configuration and Data"
-    cp /opt/homelable.env.bak /opt/homelable/backend/.env
-    cp -r /opt/homelable_data_bak/. /opt/homelable/data/
-    rm -f /opt/homelable.env.bak
-    rm -rf /opt/homelable_data_bak
-    msg_ok "Restored Configuration and Data"
-
-    if [[ -f /opt/homelable-mcp.env.bak ]]; then
+    if [[ -f /opt/homelable/mcp/.env ]]; then
       msg_info "Restoring MCP Server"
-      cp -a /opt/homelable-mcp.env.bak /opt/homelable/mcp/.env
-      rm -f /opt/homelable-mcp.env.bak
       MCP_OWNER=$(stat -c '%U' /opt/homelable/mcp/.env)
       cd /opt/homelable/mcp
       $STD uv venv --clear /opt/homelable/mcp/.venv