I use File Level Backup.
Thank you for contacting Veeam Support. My name is Adam and I will be the support engineer for this case. First and formost, and this may already be known, but incremental backups are based on changes from the previous backup run. For file level backups, these are based on the date the files were last modified.
It is hard to say as to what files were modifed from the last time the backup ran and the next time it ran. But Windows OS, tend to perform lots of changes to files in the background without the user knowing. Sometimes these changes include updates either on the file itself or even the main Windows updates.
If you are looking to find out what files are getting changed, you could try opening up the backup file using the file level restore and see which files were last updated. But when using the File Level Restore tool, the entire directory will still open up and not just the files that were included in the incremental backup. So we have no way to determine what files were included in the incremental backup without going through them one by one in the Veeam Explorer.
So at this point I would like to gather some more information. First what type of machine is this and what purpose does this machine serve in this enviornment? Are the Endpoint incremental files about the same size for each backup file? How much total data is being backed up on this machine? And any other additional information that can be included is appricated.
Thank you for sharing the results of that test. To answer your question, there isn't anything more that we can do to decrease backup sizes for a backup of the OS volume. And again this is because of the constant changes to the system files done by Windows in the background. In fact this is expected behavior for backups of the OS volume.
If you are concerned about backup sizes eating up the storage, then simple answer would be to decrease the amount of backup runs to just once a day instead of a few times a day. You might even compare the daily incrementals to the incrementals created twice a day and see if the backup file sizes are comparable. Typically the sizes should be comparable or at least close to each other, albeit likely the daily incremental will likely be larger then the other incrementals.. But otherwise, perhaps decreasing retention may help this out.
Any questions on this, please do not hesitate to ask. Otherwise, I hope this information helps out.
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