ddbr: Add description of backup/restore tv system

README.cn.md

@@ -120,6 +120,18 @@ armbian-tf
 ```
 </details>
 
+- ### 备份/还原 EMMC 原系统
+
+支持在 `TF/SD/USB` 中对盒子的 `EMMC` 分区进行备份/恢复。建议您在全新的盒子里安装 Armbian 系统前，先对当前盒子自带的安卓 TV 系统进行备份，以便日后在恢复电视系统等情况下使用。
+
+请从 `TF/SD/USB` 启动 Armbian 系统 → 输入命令：
+
+```yaml
+ddbr
+```
+
+根据提示输入 `b` 进行系统备份，输入 `r` 进行系统恢复。
+
 ## 打包命令的相关参数说明
 
 | 参数 | 含义 | 说明 |

README.md

@@ -120,6 +120,18 @@ Command: Enter [ vi /etc/fstab ]
 ```
 </details>
 
+- ### Backup/restore the original EMMC system
+
+Supports backup/restore of the box's `EMMC` partition in `TF/SD/USB`. It is recommended that you back up the Android TV system that comes with the current box before installing the Armbian system in a brand new box, so that you can use it in the future when restoring the TV system.
+
+Please login in to armbian → input command:
+
+```yaml
+ddbr
+```
+
+According to the prompt, enter `b` to perform system backup, and enter `r` to perform system recovery.
+
 ## Detailed build compile command
 
 | Parameter | Meaning | Description |

rebuild

@@ -30,7 +30,7 @@ auto_kernel="true"
 
 SKIP_MB=68
 BOOT_MB=256
-ROOT_MB=2748
+ROOT_MB=3244
 #===== Do not modify the following parameter settings, End =======
 
 die() {
@@ -503,7 +503,7 @@ while [ "${1}" ]; do
         fi
         ;;
     -s | --size)
-        if [[ -n "${2}" && "${2}" -ge "1000" ]]; then
+        if [[ -n "${2}" && "${2}" -ge "2000" ]]; then
             ROOT_MB="${2}"
             shift
         else