File incremental backup and backup speed


Does anyone have problems with backing up .vhdx files? I’m getting alot of these errors - 8000errors to be exact from the client machine debug.log file
2023-06-29 18:38:45: ERROR: FileSrv: Could not open file \?\GLOBALROOT\Device\HarddiskVolumeShadowCopy31\WimMount\Windows\winsxs\x86_xnacc.inf_31bf3856ad364e35_6.1.7600.16385_none_b381dfe1d4da7da9\xnacc.sys. The file cannot be accessed by the system. (code: 1920)
2023-06-29 19:37:03: WARNING: Parent of file with FRN 14636698789986609 (Name “00340000000FC1313C13854D”) with FRN 281474976710685 not found. Searching via MFT as fallback.
2023-06-29 19:37:03: WARNING: Parent directory not found in MFT. Was probably deleted.

And sometimes backup fails with these errors from the backup gui logs

06/25/23 18:33
Error getting complete file “t2ARuIM7tukM8u7e3725|C/HyperV/user/Virtual Machines/F155204D-1E72-4209-95DF-4A367C0135E7.VMRS” from userpc. Errorcode: BASE_DIR_LOST (7)
06/25/23 18:33
Client userpc went offline.

Am i doing backups wrong or can someone help me with it?

Is there any configuration log where i can maximize internet client backup speeds? I found a “local backup speed” that i increased to 100MBit/s but client (internet) still backups with 50Mbit/s speed. The backup runs 15h per day…