Hello @Curmudgeon1,
Welcome back!
@Roxor is correct.
So, you may also consider to use other backup tools, which doesn’t download much (only the index with hashes) when they do a snapshot, like restic or Duplicacy or HashBackup and similar.
Please note, Kopia has issues with their implementation, because they uses the prefixes without a ending delimiter and this could produce errors when the number of objects will grow up to 100k and you use the paths encryption (it’s by default), but you may bypass that flaw in their implementation by:
or
