A long time ago I modified debian-live to use btrfs-send to copy the usb image into some kind of ramfs. So you could hypothetically snapshot & send back your current snapshot to the USB as you want.
Having a kick ass fs at your back is great. Go for it!
One of my persistently greatest annoyances about running stuff on pis has been that journald is so monolithic. There's no per-app controls. I'd love to log most system functions persistently with decent sized history (since they are very low volume), but have the main app or another app do something else. Struggling to find them ATM, but there are a number of issues opened around this way back, and all closed, saying to run multiple systemd-journal instances then configure apps to direct traffic to each, but that sure sucks to setup & configure, & is something I'd hope journald would help me with out of the box.
Having a kick ass fs at your back is great. Go for it!
One of my persistently greatest annoyances about running stuff on pis has been that journald is so monolithic. There's no per-app controls. I'd love to log most system functions persistently with decent sized history (since they are very low volume), but have the main app or another app do something else. Struggling to find them ATM, but there are a number of issues opened around this way back, and all closed, saying to run multiple systemd-journal instances then configure apps to direct traffic to each, but that sure sucks to setup & configure, & is something I'd hope journald would help me with out of the box.