For last time I found HA OS have some errors during startup process.
Is it critical? Is it possible to fix?
HA OS running as VM on Proxmox.
I would expect that the ext4 file system would repair those superblock checksums automatically since those are backup superblocks. Does the error persist on reboot?
It is a bit concerning that those backup superblock checksums suddenly didn’t match. It sounds like some kind of disk corruption. Did you had power outage? Otherwise it could be a failing disk. Definitely make sure to have a full backup downloaded of that installation.
have daily backup of this VM.
Error seen only when machine starting up.
should I run any kind of disk check on Proxmox level, to see if physical disk is ok?
I have also experienced these messages on two systems. Both these systems behaved “strange”. I honestly do not remember the exact errors I got but on one system I got some error with the Supervisor which seem to made one add-on not to work. On another system, suddenly various and several integrations were not loaded. They worked fine for a while and then they just stopped working and reported that they were not loaded.
Running the following command from the host OS:
journalctcl -k -b 0 -g ‘mmc’
I get:
@agners, do you happen to know how to proceed with this? I can try to dig more if someone have ideas what to dig for. 
A duckduckgo search for "“invalid checksum for backup superblock” and “ext4” resulted in this thread and the following:
https://www.reddit.com/r/debian/comments/ya8cx0/filesystem_suddenly_readonly_on_cloud_server/
I have the same error; were you able to solve the problem?
Host operating system: Home Assistant OS 14.0
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): resizing filesystem from 31080273 to 31080273 blocks
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 32768
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 98304
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 163840
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 229376
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 294912
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 819200
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 884736
2024-12-05 13:00:34.292 homeassistant kernel: EXT4-fs (sda8): Invalid checksum for backup superblock 1605632
2024-12-05 13:00:34.292 homeassistant kernel: Adding 6702132k swap on /mnt/data/swapfile. Priority:-2 extents:298 across:122799160k SS
I have just discovered that I have the same problem. My setup is HA OS running on a Home Assistant Blue (Odroid N2+). If anyone can provide guidance on appropriate disk maintenance procedures, both normally and in response to boot log messages such as these, I for one would be most grateful.
Thanks & regards
Andy
2025-09-27 10:34:25.568 homeassistant systemd[1]: Starting Grow File System on /mnt/data...
2025-09-27 10:34:25.659 homeassistant kernel: EXT4-fs (mmcblk1p4): resizing filesystem from 30355712 to 30355712 blocks
2025-09-27 10:34:25.660 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 32768
2025-09-27 10:34:25.660 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 98304
2025-09-27 10:34:25.667 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 163840
2025-09-27 10:34:25.674 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 229376
2025-09-27 10:34:25.681 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 294912
2025-09-27 10:34:25.688 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 819200
2025-09-27 10:34:25.695 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 884736
2025-09-27 10:34:25.703 homeassistant kernel: EXT4-fs (mmcblk1p4): Invalid checksum for backup superblock 1605632
2025-09-27 10:34:25.705 homeassistant systemd-growfs[343]: Successfully resized "/mnt/data" to 115.7G bytes.