backup fsarchiver doesn;t backup whole disk

loso · 13. Oktober 2023

Hi,

This is my ssd disk:

Zitat

/dev/sda1 2048 1050623 1048576 512M EFI System

/dev/sda2 1050624 174067711 173017088 82.5G Linux filesystem

/dev/sda3 498116608 500117503 2000896 977M Linux swap

/dev/sda4 174067712 305137663 131069952 62.5G Linux filesystem

/dev/sda5 305137664 498116607 192978944 92G Linux filesystem

I set up backup in omv using fsarchiver.

When the backup completes, I have no errors.

But when I check fsarchiver the fsa file shows this:

Zitat

fsarchiver archinfo backup-omv-2023-10-13_19-41-49.fsa

====================== archive information ======================

Archive type: filesystems

Filesystems count: 1

Archive id: 652689f6

Archive file format: FsArCh_002

Archive created with: 0.8.6

Archive creation date: 2023-10-13_19-41-53

Archive label: <none>

Minimum fsarchiver version: 0.6.4.0

Compression level: 8 (zstd level

Encryption algorithm: none

===================== filesystem information ====================

Filesystem id in archive: 0

Filesystem format: ext4

Filesystem label:

Filesystem uuid: 7eb269bb-e5b9-4fe3-a14e-ae02df50becd

Original device: /dev/sda2

Original filesystem size: 80.15 GB (86061195264 bytes)

Space used in filesystem: 16.70 GB (17929945088 bytes)

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Where are the other partitions? sda1,,3,4,5

macom · 14. Oktober 2023

fsarchiver backups only the content of a filesystem.

And the backup plugin with fsarchiver backups only the OS filesystem.

If you want to have a complete backup of your drive use "full dd" in the backup plugin.

Or use fsarchiver for the OS filesystem and rsync (or rsnapshot or borg backup) for the data filesystem.

I guess you don't need a backup or swap

loso · 14. Oktober 2023

so the description in OMV is misleading

"fsarchiver - use fsarchiver to clone all partitions to an archive file"

All partitions....

many articles recommend fsarchiver over dd, why?

macom · 14. Oktober 2023

Need to check again. Did you select a root device in the plugin?

macom · 14. Oktober 2023

According to the code only the root fs and a /boot partition (if it exists) are subject to backup:

openmediavault-backup/usr/sbin/omv-backup at master · OpenMediaVault-Plugin-Developers/openmediavault-backup

Plugin to backup OpenMediaVault for emergency recovery - OpenMediaVault-Plugin-Developers/openmediavault-backup

github.com

If you check the log, you also see this. Here is an example of an sd card with two partitions. One is the root fs another one is a data partition:

Code

[...]
====================== archive information ======================
Archive type:             filesystems
Filesystems count:         1
Archive id:             6522a944
Archive file format:         FsArCh_002
Archive created with:         0.8.6
Archive creation date:         2023-10-14_11-20-27
Archive label:             <none>
Minimum fsarchiver version:    0.6.4.0
Compression level:         8 (zstd level 8)
Encryption algorithm:         none

===================== filesystem information ====================
Filesystem id in archive:     0
Filesystem format:         ext4
Filesystem label:         
Filesystem uuid:         04bf4f7c-eeca-4744-ab20-d0eb46d8e106
Original device:         /dev/mmcblk0p1
Original filesystem size:     13.36 GB (14346387456 bytes)
Space used in filesystem:     2.26 GB (2431664128 bytes)

[2023-10-14 11:24:33+0200] [backup] Backup complete.

END OF LINE
█

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Zitat von loso

many articles recommend fsarchiver over dd, why?

Don't the mention.

Advantage of fsarchiver is, that it is usually faster and the compressed data use less space, as fsarchiver only backups where actual content is, while dd will backup all space on bit level, used and unused. If the unused space is all "0" it does not matter if compressed, but if there are "0" and "1" the size increases.

macom · 14. Oktober 2023

Zitat von loso

so the description in OMV is misleading

"fsarchiver - use fsarchiver to clone all partitions to an archive file"

ryecoaaron might make sense to change the description to

"fsarchiver - use fsarchiver to clone root partition to an archive file"

ryecoaaron · 15. Oktober 2023

Zitat von macom

might make sense to change the description to

Changed to match dd - https://github.com/OpenMediaVa…5e7ffe71c4d0e865fc505d1ad

Since this description has been on there for 3+ years, I will release a new package when I have time (only have short amounts between puppy naps).

backup fsarchiver doesn;t backup whole disk

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