I’ve bumped into this issue top and now I do the following: Solve them very slowly, make a few mistakes and correct them and switch to another tab for a few seconds before submitting.

Largest one I ever did was around 4.something TB. New off-site backup server at a friends place. Took me 4 months due to data limits and an upload speed that maxed out at 3MB/s.

Make sure it’s in AHCI mode and not RAID. It’s probably a setting under storage, at least on newer ones it is.