And in the meantime i hope you have backed up each of your other PIs ?
Bad things come in 3's
Crag
There's another thread running at moment about OLED's not working with recent Node-RED/node/npm versions so you may have run into that (or similar) problem 
Hey @cymplecy, I have fixed my OLED issue .... was a typo in my function converting and preparing the text to be displayed ( paload ..... (y) missing in cation )
msg.pa**y**load = {
x:10,
y:20,
text:msg.payload
}
return msg;
Yea,,, head slap !!!
But thank you anyway for the suggestion, will keep in mind for future issues
I Just would like this opportunity to thank everyone here in NR for great support and assistance ,
Although i did not manage to recover my backups, i, unfortunately, had to rebuild everything, i did manage to work from a backup that was few days old and can say with joy that everything is back as it was and my whole system LoRaWAN authentication access control system is working like a charm and completed.
much of appreciation and especially thanks to @Steve-Mcl and @knolleary for being super starts in assisting this Rookeey / dummy !!
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Good that you are now back working, it's often a steep learning curve (I'm still climbing!!).
As your issue is no longer critical, I've removed it from the forum title.
All the best Peter.
PS
I HIGHLY recommend this simple (as long as you've got a dropbox account that is) for daily backing up - only been using it for a few days but its looks like a very simple backup solution
PS the nights it missed off were nights I was updating NR and forgot to restart it!
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Nuts... I created my own drop box thingie almost immediately... never once did I stop to ask if someone might have done it already... what a numbskull. Just for discussion, I first used a simple CMD script on a Windows 10 PC, pscp (part of putty) to pull the entire .node-red directory from each Pi. This works well, if rather simplistic.
Since then, I have finished reworking my mausoleum Pi from an old 2 model B Pi to a new Pi4 with USB 3.0... it has a couple of giant USB disks, I archive everything to as a lazy mirror of each other. This Pi also is my core media server, Samba server, etc., when not archiving at night. Just need to finish a couple of flows to retire the CMD file, and all set. Oh, I use NTFS on the USB disks, so if I have to, I can grab one of the disks and run, and have easy access to all data. Pays to have a quick DR (Disaster Recovery) solution.
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