Hello ! I have OpenWRT on Raspberry pi 4 with 32GB SD card. I posted a question about luci-app-statistics for that here about the place to save rrd files, and backup-method. And it was well taken care of: set the cron to save the backup every day to flash, and bring the newest one back upon reboot, save the backup file elsewhere every few weeks. I was lazy, so I left the backup files just there for 2 months: with 32GB it's OK.
I am setting up a similar network on Fritzbox4020. Now, unlike Raspbery pi4, it doesn't have 32GB: I suppose just 16MB, right?
And, OpenWRT for FB4020 is "all working except for USB". So, this means I can't save the files on USB. This means, if I let cron make a backup of the statistics every day like I did for Raspi, and for some reason I forget to delete the back up files for a while, or I become ill or die or whatever, the router would stop working relatively soon, right? So I need an automated thing to avoid it. If anyone has an idea/experience, I would appreciate. Perhaps having the backup emailed and delete?
Another thing, how can I actually read these backup files other than extracting them into /tmp/rrd ? it would be nice if I can somehow create a graph for a month to look at. I installed rrdtools on Raspi (another one, with RaspiOS, connected to the network) but didn't quite know how to use it. I couldn't install rrdtools on my macbook pro (mid 2012, Sierra)
I would appreciate your hints very much!