从快照snapshot 恢复Big Sur系统

根据文件描述：

APFS_SYSTEMSNAPSHOT(8) System Manager's Manual APFS_SYSTEMSNAPSHOT(8)
NAME
apfs_systemsnapshot — create and tag APFS system snapshots
SYNOPSIS
apfs_systemsnapshot -r snapshot_name -v mount_point

apfs_systemsnapshot -s snapshot_name -v mount_point
apfs_systemsnapshot -h

DESCRIPTION

The apfs_systemsnapshot utility can create or tag a new snapshot of a Signed System Volume.
apfs_systemsnapshot requires disabling the authenticated-root System Integrity Protection configuration from recoveryOS. Once disabled, non-sealed snapshots can be created and tagged as the snapshot to be rooted from.

apfs_systemsnapshot should not be used when working on kernel extension development, bless(8) should be used instead.

The mount_point parameter should be the mount point of a Signed System Volume.

The options are as follows:

-r snapshot_name
Tag snapshot_name as the root snapshot to boot from upon next boot.
-s snapshot_name
Create a new system snapshot named snapshot_name.
-h
Print a usage message.

-r 其实就是选择下次引导的快照
-s 是创建新的快照

下面进行恢复操作

• 进入Recovery 模式
• 选择terminal工具，先查看磁盘 diskutil list 查看系统分区在哪个磁盘下，
  这里可以看到为 disk3s2 ，
• 查看快照 diskutil apfs listSnapshots disk3s2 , 记录或者复制snapshot的name 名字
• 或者先挂载此磁盘分区 diskutil mount disk3s2 ,其一般自动挂载到 /Volume/MacOS/ 此分区名下一步要使用到。
• 根据 apfs_systemsnapshot -r snapshot_name -v mount_point 的命令方式
• /System/Library/Filesystem/apfs.fs/Contents/Resources/apfs_systemsnapshot -r "*snapshot的Name 名字*" -v */Volumes/MacOS*

重启完成