Fix Error "0x8078015B" when doing an image backup from win 10 on samba share

I'm trying setting up backups for my computer on a samba share and getting this error on windows 10: Windows Backup encountered an error when accessing the remote shared folder. Please retry the operation after making sure that the remote shared folder is available and accessible. (0x8078015B) Backup is working fine on Windows 7.

I've tried the following already:

• Cleaning the shared folder from older backups
• Checking the filesystem for errors with chekdsk /f /r -> there was nothing to repair
• Deaktivating antivirus
• Checking if windows services are set up and running
• Checking for accesebility
• Deactivating Wifi

Set up for samba is as follows:

• Debian server with an encrypted extarnal harddrive connected via USB and mounted through a device mapper-
• 1TB space for every user on a 10TB harddrive (windows 10 client has a 250GB Harddrive).

Samba configuration

   workgroup = WORKGROUP
   dns proxy = no
   log file = /var/log/samba/log.%m
   log level = 1 auth:5 winbind:5
   max log size = 1000
   syslog = 0
   panic action = /usr/share/samba/panic-action %d
   server role = standalone server
   passdb backend = tdbsam
   obey pam restrictions = yes
   unix password sync = yes
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
   pam password change = yes
   map to guest = bad user
   usershare allow guests = no
   ntlm auth = true
   map untrusted to domain = Yes
[homes]
   comment = Home Directories
   # path = /var/samba/backup_drive/users/%u
   path = %H
   browseable = yes
   read only = no
   create mask = 0700
   directory mask = 0700
   valid users = %S

Links I have tried:

• [FIX] Error 0x80070079: The Semaphore Timeout Period Has Expired
• I get error code during backup: 0x8078015B
• How to fix Windows Backup Error Code 0x8078015B