DCI Mar 7 5:21PM 2018 GUI
We are backing up our veeam backups to BackBlaze. Veeam currently only backs up changes to the client system and then merges those changes into the full backup.
However each time it merges changes, it renames the full backup file name.
Can Duplicacy recognize the file with its new name, or will it treat it as a new file and push the entire file to BackBlaze again?
gchen Mar 7 9:11PM 2018
It will be treated as a new file, but because every file is split into chunks first, if the file content doesn't change, then most of the chunks already exist in the storage so they won't be uploaded again. Therefore, backing up a renamed file will be a very fast operation and consume little bandwidth.
Christoph Mar 9 6:22AM 2018
Therefore, backing up a renamed file will be a very fast operation and consume little bandwidth.
To be fair, though, duplicacy is currently not as good as it could be in handling this kind of situation (renaming or moving of files). See this very interesting and promising discussion on Github for details:
https://github.com/gilbertchen/duplicacy/issues/334
gchen Mar 9 10:12PM 2018
I don't have any experience with Veeam, but I would guess that those backup files should be quite large. If so, then when you rename a large backup file then at most a few chunks at the beginning of the file and one chunk at the end of file will need to be uploaded. Most other chunks should remain the same and can be quickly skipped.