7zip accees to folder denied on Windows 2016 server

I get this Error when trying to compress with 7zip with zip it is ok
Platform is windows 2016.
On windows 2008 R2 there is no problem.

16/06/2018 13:01 Starting job "Test " - “Full”. Computer “APP”. App v.“11.6.3”
16/06/2018 13:01 The backup folder “C:\dl\1\Pranas.NET\SQLBackupAndFTP\backup” has “11.670GB” free space. The temporary folder “C:\dl\1\Pranas.NET\SQLBackupAndFTP\backup” has “11.670GB” free space
16/06/2018 13:01 Backing up “.\SQLEXPRESS” LocalSqlServer databases
16/06/2018 13:01 Getting maximum file size…
16/06/2018 13:01 The maximum file size: “10.000GB”
16/06/2018 13:01 Backing up “testonly” database to .bak file. Backup type: “Full”. Checksum: “Disabled”
16/06/2018 13:01 “testonly” database backup successfully completed. Backup type: “Full”
16/06/2018 13:01 Database “testonly” successfully backed up to “testonly201806161301.bak : 1.458MB”
16/06/2018 13:01 Compressing “testonly201806161301.bak” file with 7zip archiver. Encryption: “Off”
16/06/2018 13:01 Backup of “testonly” successfully compressed to “(testonly201806161301.7z : 65.793KB)”
16/06/2018 13:01 Backing up folders
16/06/2018 13:01 Backing up “Sources” folder in C:\Sources\
16/06/2018 13:01 Compressing “C:\Sources” folder with 7zip archiver. Encryption: “Off”

16/06/2018 13:01 Failed to backup “Sources” folder in C:\Sources. 7-zip archiver error. > Access to the path is denied.

16/06/2018 13:01 Connecting to OneDrive destination “Psiphas Cloud”
16/06/2018 13:01 The current destination folder is “/TTT”
16/06/2018 13:01 Sending backup of “testonly” to OneDrive destination “Psiphas Cloud”
16/06/2018 13:01 Reading the folder information: “testonly”
16/06/2018 13:01 Uploading local “testonly201806161301.7z” to remote “testonly201806161301.7z” in folder “/TTT/testonly”
16/06/2018 13:01 Uploaded 100 % (average speed = 21.6 KB/s)
16/06/2018 13:01 Verifying remote file “testonly201806161301.7z” with local one “testonly201806161301.7z”
16/06/2018 13:01 Cleaning up backups of "Test " job
16/06/2018 13:01 Cleaning up backups of “testonly” database at OneDrive destination “Psiphas Cloud”
16/06/2018 13:01 Disconnecting from OneDrive destination “Psiphas Cloud”
16/06/2018 13:01 Job "Test " finished with “1” errors
16/06/2018 13:01 Sending job log to aviby@psiphas.com
16/06/2018 13:01 Sending report to ${https://sqlbackupandftp.com/weblog?jobid=fb67f579-10a9-4778-b7a4-097e02c6f5b3|Web Log}

Hi,

Thanks for the details.

You get this error message because of the user permission issue. Please make sure that the local system user has enough permission to the C:\source folder. If you use Windows Authentication to connect to your SQL Server, also, grant all permission to the user you use to log in.