Oh I see ok thanks for the information, I did see it was experimental but wasn't aware it had been so for so long.
If do points 1 and 2 I'm assuming the files will be downloaded to be hashed, maybe somewhere temporary.
It's an IDrive remote and they are increasing their prices for the 2nd year, but more than I was told when I signed up so was thinking of ditching them and using local storage instead.
I have a JottaCloud Drive for anything important. The IDrive was just a nice to have storage dump.
idrive continues to play a game, first year low price, second year price increases by a lot.
at one time, i have 5TiB with idrive, but they kept raising price year after year.
for many years, i push old backups, that i never plan to need, to aws s3 deep glacier at $0.99/TiB/month
and hetzner storagebox, imo, the best overall storage option.