The backup installation does not leave

Hello. I have H. A. on the computer through Linux. I decided to make a backup and put on another computer. On the start page where you are offered to start anew or restore from the backup I select a copy and file from the first computer. After long waiting, I get a 400 bad request error.

Choose start anew, go through onboarding, and then restore the backup.

it didn’t help. still the same mistake.