I have multiple backup jobs from my NAS to JottaCloud.
For most of them I have set backup-test-percentage to 5 (in the general settings), for some of the backup jobs I have put it to 10 (in the individual backup job’s settings).
However, when looking at how much is downloaded, and comparing it to the total backup volume, it seems to me that the percentage that is downloaded is more or less double of what should be downloaded. I am checking this by comparing the value for “BytesDownloaded” in the full log (under “Testresults”,“BackendStatistics”) versus the backup size under the job in the main screen.
It seems consistent - for the jobs where I put backup-test-percentage to 5%, about 10% is downloaded and for those where I put it to 10% about 20% is downloaded. It is also consistent with the download volume shown in my ISP’s traffic statistics.
Backup-test-samples is not set so this could not be the cause.
I am running Duplicati - 22.214.171.124_beta_2020-01-18 on a Synology DSM 216+ via Docker.
Is this expected behaviour? How much data is effectively being tested - the percentage that I put or the double?