Improvement in backup and restore process

Could be a good idea to have a backup GUI, where you could select one by one what do you want to backup.
For example, if you have three devices and three wallets, maybe you can backup only one wallet, could be helpful to have the option to choose only the wallet.

The same situation in the restore process could be cool to have the possibility to choose what do you want to restore from the backup file.

The issue does not name any files, tests, or entry points. Start by locating the existing backup and restore workflows, then define how wallets and devices are represented in the backup file; done means both workflows can select individual items without losing the remaining backup data.

Written by the indexing model from the issue text.