So, after this procedure can I be sure that all files in backup is OK? There is some error before: https://forum.duplicati.com/t/error-than-backup-to-local-network-storage-got-0-warning-s/2438/2
The verification process at the end of each backup job downloads one or more random files from the backend, calculates the file hash and verify if the hash matches with the expected value that is read from the local database. So it does not “fully verify” and not “all files”.
You can set the number of files to download for verification using advanced option
n with the number of files you want to download.
If you want to decrypt the downloaded files and check the complete contents of the downloaded file, instead of calculating the file hash, supply advanced option