OMV with btrfs as root file system (preseed.cfg)

Hi! I have noticed, that preseed file in installation media of omv 6.0.24 tells Debian installer to create EXT4 as root fs. Is there any particular reason for that? I have installed it with changed option d-i partman/default_filesystem string to btrfs as root and it works so far. I wonder if this was good idea or not. Any thouths?

macom Thanks for constructive answer. Have you ever tried to restore rootfs from any snapshot?

I do monthly backups of OMV's SSD with ddfull, but I wonder if snapshot can be used to recover from system failure.

I am using BTRFS as single partition without swap on six installations and no problems found. Thanks to macom I installed snapper and snapshots work fine too.

My preseed configuration (partitioning part)

REMEMBER to disconnect all other drives when installing

### Partitioning 4 legacy

d-i partman-auto/method string regular

d-i partman-auto/disk string /dev/sda

d-i openmediavault-installer/partman/multiple_target_devices select continue

d-i partman-auto/expert_recipe string \

no-swp :: \

500 5000 100% btrfs \

$primary{ } \

$bootable{ } \

method{ format } \

format{ } \

use_filesystem{ } \

filesystem{ btrfs } \

mountpoint{ / } \

.

d-i partman/confirm boolean true

d-i partman-basicfilesystems/no_swap select no

d-i partman-partitioning/confirm_write_new_label boolean true

d-i partman/choose_partition select finish

d-i partman/confirm boolean true

d-i partman/confirm_nooverwrite boolean true

After unattended installation I run script that includes installing and configuring snapper with command

snapper -c root create-config /

After some time I see snapshots in /.snapshots/1 or something like that with all files of root file system.

I need to do separate file for EFI installation, but I do not have time.

I have read somewhere that even booting to a snapshot is possible, but did not test it. I wonder, if it is possible to do automatic fallback to earlier snapshot if starting system fails like three times.