MacBook Pro 时间机器的备份恢复时提示异常，用 fsck_apfs 工具无法修复

电脑重置后用装在群晖的时间机器备份来恢复，提示备份异常，让我抹除后重新备份。

备份文件后缀为sparsebundle，我尝试用命令行恢复，结果报错了，提示 invalid o_cksum (0x30307473696c7062)

  Object map is invalid.

从备份记录看，最新的备份是2025年3月16号，现在我想能否删除部分文件，恢复到24年某个时间点。

尝试的具体步骤和结果如下：

1、chflags -R nouchg "/Volumes/timemachine/XXXMacBook Pro.sparsebundle"

2、hdiutil attach -nomount -readwrite -noverify -noautofsck "/Volumes/timemachine/XXXMacBook Pro.sparsebundle"

3、fsck_ahfs -y /dev/disk4s2

输出结果：

** Checking the container superblock.

  Checking the checkpoint with transaction ID 83778.

warning: container has been mounted by APFS version 2313.41.1, which is newer than 2142.140.9.703.1

warning: disabling overallocation repairs by default; use -o to override

** Checking the space manager.

** Checking the space manager free queue trees.

** Checking the object map.

** Checking volume /dev/rdisk5s1.

** Checking the APFS volume superblock.

  The volume XXX的备份 was formatted by newfs_apfs (2142.140.9.701.2) and last modified by apfs_kext (2313.41.1).

** Checking the object map.

warning: (oid 0x5251b9d) om: btn: invalid o_cksum (0x30307473696c7062)

  Object map is invalid.

** The volume /dev/rdisk5s1 was found to be corrupt and cannot be repaired.

** Verifying allocated space.

** The container /dev/disk4s2 could not be verified completely.

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