I ran 2 tests:
1/
rclone purge <rclone_path>
kopia repository create rclone --remote-path=<rclone_path> --block-hash “BLAKE3-256-128”
kopia policy set <rclone_path> --compression=zstd-best-compression --one-file-system=true --keep-latest 3
kopia snapshot create <some_folders>
2/
rclone purge <rclone_path>
kopia repository create rclone --remote-path=<rclone_path> --block-hash “BLAKE3-256-128”
kopia policy set --global --compression=zstd-best-compression --one-file-system=true --keep-latest 3
kopia snapshot create <some_folders>
The only difference between those 2 sets of commands is the usage or not of the parameter “–global” in the policy.
<some_folders> is the same set of folders in both cases.
<rclone_path> is a rclone entry pointing to a webdav share in kdrive.
I get those results:
zstd-best-compression global
backup time : 53m35s
data total size : 16.3 Go
compressed size : 14.5 Go
compressed part : 14.5 Go
non-compressed part : 1,8 Go
compression rate : 11.0%
zstd-best-compression local
backup time : 24m49s
data total size : 16.3 Go
compressed size : 16.3 Go
compressed part : 4,9 Mo
non-compressed part : 16.3 Go
compression rate : 0.0%
Is there any reason to get so different results ?
Should I use global policy to get at least partial compression ?