Just an update:

I have switched VPS providers, hopefully this stops lag, and the server randomly going down.

Rollbacks are now supported, but they should have been this entire time

Also, since the server has been going down lately, as well as griefing has been happening on the server, there is now protection put into place. I would also recommend using a mini-map mod to log your deaths just in case the server goes down and you cannot get your stuff back.