If you want to try setting it up in high availability with failover, give me a poke. And until then - go to Teleporter in the settings, and download the backup. You can restore from there.
One thing worth saying is this - you can grab a cheap refurbished ssd (the smaller - the better), check it’s SMART data for any red flags, and attach it to the pi as OS disk. It will be much more reliable than SD, but overkill if you only run pi on the box. Alternatively look into log2ram, it keeps your SD card alive for longer :D but backup first!