100-fold increase in regular incremental backup size using blksnap over veeamsnap

### Distribution Ubuntu 22.04.5 LTS ### Architecture x86_64 intel ### Kernel version Linux 6.8.0-52-generic #53~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Jan 15 19:18:46 UTC 2 x86_64 x86_64 x86_64 GNU/Linux ### Blksnap version Version: 6.3.0.73 deb from apt-get ### Bug description Hi, I'm not sure if this is a bug per-se. I'm checking if it's normal for the Veeam incremental files with blksnap to be 100 times larger than the Veeam incremental files created with the older veeamsnap. Mine have ballooned from ~14MB daily to ~1.2GB daily. I updated Veeam Backup Agent for Linux a couple of weeks ago and found that the new version required the use of blksnap. So I installed that which replaced veeamsnap, I also noticed that blksnap supports Secure Boot now - so I enabled this in my BIOS and went through the process of authorizing the MOK. I re-ran the backup config to reconfigure and run a test backup. Everything worked great, so far so good. However I've checked on the backups now and noticed that the incremental backup files (.VIB) which were previously ~14MB each day are now ~1.2GB, this is not a server that has a lot of data change daily so the increase is unexpected and I can't account for it other than the veeamsnap to blksnap change. Screenshots of the NAS file sytem showing the backups, attached. veeamsnap:  The transition from veeamsnap to blksnap:  ### Steps to reproduce Perhaps hard to reproduce. - Configure entire machine backup in Veeam to shared folder (SMB), monthly full backup, daily incrementals. - Run a veeamsnap full backup, run some incremental backups (preferrably over a few days, so some data has changed) - Install blksnap (uninstalling veamsnap automatically), run a full backup, run some incremental backups (pref over several days) - Compare incremental backup sizes between the two systems ### Expected behavior I'd expect the incremental backup sizes to be similar betwen both backup mechanisms as they're both disk-level, a 100-fold increase is absolutely massive. ### Additional information I could not find any other threads discussing this increase so I thought it may be unique to my situation, or something I've misconfigured. Normal? Any suggestions? Is there a configuration option I can change for better compression or something? Thanks for your help.