Backup to Windows Network Share

Hello,
I want to backup a Oracle Database to a Windows Server via Network-Share. I set
backup_root_dir =
servername\share. The sidadm and sapservicesid have full access to the share.
If I start the backup I get a error message:
BR0282E Directory '\\servername\share' not found
BR0182E Checking parameter/option 'backup_root_dir' failed
This is my config
backup_dev_type = disk
backup_root_dir = \\servername\share
stage_root_dir = \\servername\share
archive_copy_dir = \\servername\share
archive_stage_dir = \\servername\share
What is wrong?
Is it possible to with Brtools to backup to an Windows-UNC-Path? Has anyone a solution?
Best regards
Thomas

Yes,  I did not read it to the end.  Now I did. But for me this subfolder thing is already realized. See below. So I am more interested in the question of br tools version. I had the idea that the error disappears with a newer version of br tools. And next I am interested in is the item with backup_dev_type 'pipe'.
I have to admit that my error is different from the one in this thread. But it is related to the topic. I do also backup into a share. But I do get errors after some time of the type:
BR0278E Command output of 'E:\usr\sap\MFE\DVEBMGS00\exe\mkszip -c F:\ORACLE\MFE\SAPDATA6\BTABD_16\BTABD.DATA16 >
flsback\backup\SAPT1_MFE\onl_full\bebjoinc\BTABD.DATA16.Z':
mkszip: output file "[standard output]": The specified network name is no longer available.                                                                               
Any ideas?
Or shall I open a new thread for this?

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    Any further information please feel free to let us know .
    Best Regards,
    Elton Ji
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