[Borgbackup] What to do if file is lost?

[Tomasz Melcer]

On 06.07.2016 17:44, Marian Beermann wrote:
> The data files is another story. There's no forward error correction in
> Borg itself, so errors can be detected but only some minor errors can be
> corrected. "borg check --repair" will replace corrupted data chunks with
> runs of zeroes of the same length, while saying where it did that.
> Corrupted commit tags can take some more data with them to nirvana.

So, please correct me if I'm wrong:

Let say there was a bad block inside one of the data files. After 
recovery I can just run `borg check --repair`, and while some of the 
data will be lost, other chunks will still be there. Therefore, I can 
fully recover all past backups except for the chunk(s) hit by the bad 
blocks.

One more question. If the next backup will happen to have the same 
chunk, will it be added to the backup, filling the missing part for 
older backups? In some scenarios I find it likely that a possible bad 
block could just hit a chunk of one of the files that are still 
available on the live system.


-- 
Tomasz Melcer