Marcus,
I have been running one of these units with weewx on a RPI3 since mid
October. The console is telling me the log is full and to connect it to
the PC to clear it out. It has been telling me that since 12 days after I
set it up. But it still works fine with weewx. From what I can
I use raspiBackup to make online image of my SD card after I saw it
mentioned by someone else on this board.
https://www.linux-tips-and-tricks.de/en/raspberry/303-pi-creates-automatic-backups-of-itself
I keep my database, config files and webpages on a NFS share which has its
own backup.