For some reason, I tried to snap a subdir of a dir already snapshotted recently. Files are unchanged between the 2 snaps. Kopia started to upload data. I canceled the snap, but it looked like it was uploading everything from scratch. In the logs, I can read messages like: “could not find cache entry for file1”. Mounting the snap of the dir, I can check that file1 is here and is byte for byte identical to the original file.
I could not reproduce that using randomly generated test files in a subdirectory.
Referring to Kopia re-uploads data, zstd is used but always from the same machine.
Is this to be expected? How could I identify the issue if any?