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Could an update work as well, at least to give me a chance for a new start?

Hard to say, worth a try.

My last backup is for 0.86.2

:grimacing:

And for the future… how do I best backup my Lovelace setup?

If you are using Hassio you can automate snapshots, e.g.

- id: daily_backup_at_1_am
  alias: Daily Backup at 1 AM
  initial_state: true
  trigger:
    platform: time
    at: '01:15:00'
  action:
  - service: hassio.snapshot_full
    data_template:
      name: Automated Backup {{ now().strftime('%Y-%m-%d') }}
  - service: notify.telegram_system
    data_template:
      title: '*Information*'
      message: "Creating backup named Automated Backup {{ now().strftime('%Y-%m-%d') }}"

Then it is just a matter of regularly copying the the snapshots somewhere else. I use a progran call free file sync on another PC that is always on to copy my snapshots. Then run a custom component to clean up the old ones:

- id: daily_snapshot_clean_up
  alias: Daily Snapshot Clean Up
  trigger:
    platform: time
    at: '06:17:15'
  action:
    service: clean_up_snapshots_service.clean_up

This is all very complicated and I recommend you just use this (like I should):