Add an option to cancel the backup before it actually started?

[tsusanka]

It is impossible to abort the backup even though the words where not yet shown. Example:

• trezorctl wipe-device
• trezorctl reset-device --skip-backup
• trezorctl backup-device

will get you to this screen:

If you unplug the device now, it will make the backup failed. Shouldn't we provide the user a way to cancel it (e.g. they want to do it later)? We can:

1. Leave it as it is.
2. Add a screen "Do you really want to back up your device", which sounds a bit superfluous.
3. Proclaim the backup as started after clicking on I understand.
4. Add a Cancel button to the mentioned screen and start the backup after confirming.

[tsusanka]

We have agreed option (3) is the way to go.

[tsusanka]

However, the screen above applies for BIP-39. For SLIP-39 the first screen is the Recovery "todo list". It probably makes sense to start the backup progress after confirming that.

[tsusanka]

Upon discussion with PO we have concluded this is not needed. We plan to have this screen in Suite, which we believe is enough to inform the user: