Two points on that. We can't help someone recover another person's server. The owner of the original server would need to do that.
Also
Pre 2017 is LEET V1. Post 2017 is LEET V2
LEET V2 released in 2017 and if you did not manage to migrate over to LEET V2 during the time frame given then, it is with regret that I must say that all data from LEET V1 have been permanently wiped.
We gave a long enough period for users to migrate over to LEET V2 and if did not upgrade from V1 to V2, then I am afraid there is nothing we can do at this point.
I recon LEET is reasonably stable. The only versions we know are not fully stable is the BETA versions on the "Server Versions" list.
Our lead developer tends to push an update faster than the server software we use. (Which tends to be "BETA" until it's fully tested).
The support team is on our discord server. Just create a ticket, and the ticket will be seen to. Otherwise, the community in discord are happy to help!
The lag depends on how many plugins you have running too many events, or MadCommands running very frequent loops. Network lag depends on where you are. I believe the servers are based in Germany. My friend who lives in the US says he gets around 110ms ping, so that's decent.
As for plugins, Our developers update plugins all the time. With each Minecraft update, it could potentially mess with the functionality of some plugins. If it does, we do appreciate users letting us know.
I hope I answered your questions,
HBIDamian
Head of the Community Team