OpenMediaVault 备份插件还原系统方法
OMV 社区插件列表中提供了 Backup 插件，可以通过 dd、fsarchiver 和 rsync 三种方式对系统进行备份，但是插件界面只能执行系统备份，无法进行系统还原。
使用插件备份系统非常简单，略去不表，以下主要以 fsarchiver 备份为例记录还原系统的方法。
fsarchiver 备份的文件位于插件中指定目录下的 omvbackup 目录中：
omvbackup$ ls
backup-omv-11-Mar-2020_15-43-35.blkid backup-omv-11-Mar-2020_18-02-37.blkid
backup-omv-11-Mar-2020_15-43-35.fdisk backup-omv-11-Mar-2020_18-02-37.fdisk
backup-omv-11-Mar-2020_15-43-35.fsa backup-omv-11-Mar-2020_18-02-37.fsa
backup-omv-11-Mar-2020_15-43-35.grub backup-omv-11-Mar-2020_18-02-37.grub
backup-omv-11-Mar-2020_15-43-35.grubparts backup-omv-11-Mar-2020_18-02-37.grubparts
backup-omv-11-Mar-2020_15-43-35.packages backup-omv-11-Mar-2020_18-02-37.packages
一次备份会产生以下几种类型的备份文件：
.blkid：blkid 命令的输出.fdisk：fdisk -l 命令的输出.fsa：fsarchiver 实际的备份文件.grub：grub 所在的磁盘最前的 446 bytes 数据.grubparts：磁盘的前 512 bytes 包含 grub 和分区表.packages：dpkg -l | grep 命令的输出
系统还原到原磁盘
假设新磁盘设备名为 /dev/sde
omvbackup$ sudo fsarchiver restfs backup-omv-11-Mar-2020_18-02-37.fsa id=0,dest=/dev/sde1
Statistics for filesystem 0
* files successfully processed:....regfiles=36930, directories=4498, symlinks=3205, hardlinks=9, specials=10
* files with errors:...............regfiles=0, directories=0, symlinks=0, hardlinks=0, specials=0
系统还原到新磁盘
假设新磁盘设备名为 /dev/sde
首先，恢复磁盘结构：
omvbackup$ sudo dd if=backup-omv-11-Mar-2020_18-02-37.grubparts of=/dev/sde
1+0 records in
1+0 records out
512 bytes copied, 0.00548499 s, 93.3 kB/s
查看恢复后的分区结构：
omvbackup$ sudo fdisk -l /dev/sde
Disk /dev/sde: 28.7 GiB, 30752636928 bytes, 60063744 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1851daa6
Device Boot Start End Sectors Size Id Type
/dev/sde1 * 2048 60061695 60059648 28.7G 83 Linux
然后，将 grub 恢复到 /dev/sde1 分区：
omvbackup$ sudo dd if=backup-omv-11-Mar-2020_18-02-37.grub of=/dev/sde1
0+1 records in
0+1 records out
446 bytes copied, 0.00595929 s, 74.8 kB/s
查看备份文件信息：
omvbackup$ sudo fsarchiver archinfo backup-omv-11-Mar-2020_18-02-37.fsa
====================== archive information ======================
Archive type: filesystems
Filesystems count: 1
Archive id: 5e61e054
Archive file format: FsArCh_002
Archive created with: 0.8.1
Archive creation date: 2020-03-11_18-02-37
Archive label: <none>
Minimum fsarchiver version: 0.6.4.0
Compression level: 3 (gzip level 6)
Encryption algorithm: none
===================== filesystem information ====================
Filesystem id in archive: 0
Filesystem format: ext4
Filesystem label:
Filesystem uuid: e59edec2-d4e7-4e72-8f3b-3a7cb2c2fdf2
Original device: /dev/sdd1
Original filesystem size: 28.06 GB (30131867648 bytes)
Space used in filesystem: 1.66 GB (1785688064 bytes)
最后，执行系统恢复：
omvbackup$ sudo fsarchiver restfs backup-omv-11-Mar-2020_18-02-37.fsa id=0,dest=/dev/sde1
Statistics for filesystem 0
* files successfully processed:....regfiles=36930, directories=4498, symlinks=3205, hardlinks=9, specials=10
* files with errors:...............regfiles=0, directories=0, symlinks=0, hardlinks=0, specials=0