Lineage-16.0 (Android Pie) Nightly

Yes.

Depends.

  1. You can try a custom TWRP build which attempts to decrypt Android 8/9 encryption and see whether you’re lucky and it works for you. It has been seen working here and there, but not reliably for everybody.
  2. TWRP backups are working, but if TWRP can’t access the data partition, then the data partition will not be part of a TWRP backup. Be aware that TWRP doesn’t backup the whole data partition anyway, even if it has access to it.
    A backup of the files in an encrypted data partition can be made using other means while Android is running. ADB backup is a simple way, but restoring is a mess. Titanium Backup gets mentioned quite often for any scenario.

I wouldn’t count on it, as currently two experienced community developers tried to get TWRP to decrypt Android 8/9 encryption on the Fairphone 2 and don’t know why it doesn’t work (reliably at least). It seems quite elusive.

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