All files in the backup chain are modified on the block level during merge process in VEB. Third party tools usually work on a file level (basically, track the file modification date of the file), thus they replicate all backup chain again after every job run.
VBR Free don't work with Veeam Endpoint Backup. True?
Restores are fully functional, however, integration with VBR repository and backup copy job requires licensed VBR console.