Epic: Backups

[iAmMichaelConnor]

Low priority at the moment, but adding here so we remain aware of it.

We would like to enable users to have the option to:

• Store encrypted backups of:
  • PXE keystore data;
  • PXE private state data (note and nullifier preimages and other metadata)
  • PXE shared secrets
  • Any additional metadata about any incoming data.
  • Data about txs the user has sent:
    • A backup of the entire witness to the tx. That is, all data that was used to generate all app circuit and private kernel proofs.
    • Details of the public aspects of the tx (block number, tx index, leaf indices touched, public function data, gas used, etc.)

Using all this data, a user should be able to replay the transaction and get the same result as the original, akin to Tenderly Simulation.

(Please feel free to edit this comment to add requirements to this issue, and to add a tasklist, once requirements are more clear).