vzdump - no longer rsyncable?

[alex123]

Hi,

i noticed a strange behavior with my latest rsync jobs. I run vzdump with the following parameters.

vzdump 101 103 102 --mailnotification always --mode snapshot --quiet 1 --mailto alex@example.local --compress 0 --storage local

After that I run rsync to an off-site location. When I now run vzdump again after like 5 minutes rsync shows a huge diff.
Job 1 (Initial Rsync) finished at 23:43:

2024-12-05 23:43:53 INFO: SourceFileSize 37909359104 (35.3 GB)

Running vzdump + rsync again:
Job 2 (incremental) finished at 00:04:

2024-12-06 00:04:09 INFO: SourceFileSize 37941377536 (35.3 GB)
2024-12-06 00:04:09 INFO: TotalDestinationSizeChange 6737840149 (6.28 GB)

6.28 GB changed while the source file size remains almost the same. Waited an hour before running vzdump + rsync again:

2024-12-06 01:03:36 INFO: SourceFileSize 37971732992 (35.4 GB)
2024-12-06 01:03:36 INFO: TotalDestinationSizeChange 7195668836 (6.70 GB)

Source file size and destiniation file size almost the same again.

Looking through the logs it appears like to be related to the Proxmox 8.3 release. Older jobs look like this:

2024-11-06 01:06:27 INFO: SourceFileSize 37830867456 (35.2 GB)
2024-11-06 01:06:27 INFO: TotalDestinationSizeChange 206097646 (197 MB)

and were running fine for the last 4 years.

I have seen that some compression things were modified in proxmox-backup. But I am not using compression. What am I missing here?

Thanks,
Alex