Incremental backup question

[illllm]

Question about incremental forever backups : When a file is modified, does the incremental backup, backup only the changes or is the entire file backed up regardless of the number of changes?

 

[marclant]

Question about incremental forever backups : When a file is modified, does the incremental backup, backup only the changes or is the entire file backed up regardless of the number of changes?

The entire file. Unless you use client-side dedup, in which case it backs up only new extents.