Does kopia scan always all file content when creating a snapshot?


I couldn’t find reference to file metadata like ctime/mtime/size to avoid re-reading all data an unchanged file in the kopia documentation, some backup software have this feature:

Does kopia implement this and if no is it planned?

Yes. Kopia does that by default. To force rereading file even if modification time matches you can pass —force-hash flag set to a percentage (0…100). This will apply to the specified percentage of files.

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