I’ve a few days of data (only) using the June 15 sd card image system. I’d like to upgrade to 3 May sd card system. Is there a recommended process for doing this, which minimises down time - or is it a matter of backing up what data I have, re-flashing the sd card, doing any jessie updates, expanding the data partition, and restoring the data and carrying on? I can imagine my system might be down for an hour or two and that I’ll lose the data that would otherwise have been logged during that period. That’s fine if it has to be, but if there is a better way, I’d really appreciate knowing.
What I’ve done pre-emptively is (just now) buy another RF hat from the store which I intend to put on a pi3 I have elsewhere do most of the above whilst logging data in parallel (should work?) with the existing pi, do a backup from old system, restore to new, and carry on. Not certain that is possible, but will try.