Once you are sure everything is correct for the initial boot into your configured system, commit your changes
For the initial commit and reboot, use an unencrypted LBU (to make sure everything works).
Netboot Alpine with iPXE
You should backup your system to least one other system.
LBU backups allows restoring to previous state but lack commented history.
Etckeeper is even better stored in an off-system private repository.