How to backup and fix system with Full Disk Encryption

I have a plain Manjaro-only install with FDE.
I am concerned with every reboot, what do I do if something goes wrong. With an unencrypted disk worst case I can do a full reinstall and get the data from the old disk.

  • Would I need to backup some encryption key if something goes wrong and I would like to read from my original disk with another/new install ?

  • Where can I find any resources what to do if something goes wrong (i.e. encrypted disk gets corrupted) ?

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This is a good read, though I’m afraid it doesnt cover encryption.

Of course if your data is safe then the worst thing to happens is a reinstall.