Here is my tale of woe, after building up a new instance of HA on a Raspberry Pi4, and getting all the configurations working as expected. Mother nature threw a curve ball my way via a substantial thunder storm. The resultant power bump laid waste to the Pi board. The memory card is intact and I can access all the files. I have rebuilt my older Pi3 and was wondering if there might be a way of pulling what ever necessary configuration files from the Pi4 card and placing them on the Pi3 so I don’t have to start over from scratch. I did not do a system back up of the Pi4 prior to the storm.
Check the backup folder as the default when updating HA is for it to make a backup.
Otherwise if you have access to the card you can copy the contents of the folders. I am not sure which folders but someone will answer that iin the next post, or search the forums for details.
A pi 3 will unfortunately not have enough memory to run HA. It will very quickly run into issues.
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You don’t say what was configured. But almost everything was in the /homeassistant folder and then in two big files called “configuaration.yaml” and “automations.yaml and you can cut and past from the old files to the new files. Set up a new but “empty” HA server and then copy the old /homeassistant folder to /homeassistant_DeadPi. I doubt a wholesale copy would work but cut and past via a text editor should. But deatils vary, were you using z2m? and 100 details like that matter.
Mostly just cut and past a little but then test then backup and then repeate as required. If you spent a lot of time on automations then most of what you want is in that automations.yaml file.
Finally a Pi3 is borderline under powered. If you need to buy something, a used Mini-PC is a better value. Prices well under $100.
No need to tell you now to backup to a location that is not on the HA server, and copy the backups to an off site location.