Hi DivineOubliette and welcome,
failed task3 error refers to a "verify" error when using VSO.
Unfortunately the verification function in VSO is useless
and does nothing but create problems.
In Common Settings > Write simply untick
Verify disc after finished burning
Does the bkup disc play ok in your dvd player?
The Finalization error may be a false error report.
If the bkup discs aren't finalized, you can still salvage and finalize them.
This looks complicated, but it only takes seconds.
DVDFab Finalize a disc
Right click on the Fab Icon >
Left click Properties >
Left click Find Target >
Left click PcSetup.exe >
Left click on the + in front of Patin-Couffin driver >
Now left click once to select your burner >
Right click on the selected burner >
Navigate to the bottom of the dropdown to Finalize the media
Frankly, I'd do as Dialysis and my good friend signals suggest
and dump VSO and please post the burn log as suggested.
Fab users have seen a lot of problems with it.
Img is much more reliable and configurable.
If you're interested, Img's verify function works just fine.
Please make the following change in Img:
tools > settings > build > don't prompt image details
This will create a seamless process for SL burning.
The Img window will pop up, but will not require any action from you.