The 1.17 update

The Update
The 1.17 update brought a lot of difficulties to the server. To player data first not working to 75% of the world being completely corrupted and the server had to revert back to a world file from March 2021. We will take a in-depth look on how this happened to the server, how this can be prevented and what the current player-base needs to know.

Player data "corrupted"
Basically as soon as the server updated, nobody could login. When a user would login the server would crash. We're not really sure why this issue happened, but we are guessing it was a spigot / papermc issue. Updating Papermc the next morning fixed the issue.

75% of the world corrupted
As soon as we could login to the server, we realized 75% of the server was corrupted. Again, were not really sure why Paper re-generated 75% of the world. But, what we are doing is making a backup before a upgrade. Normally during a Minecraft Server update, nothing really happens. The server doesn't really care that you've upgraded. For some reason. if it was because of a exploit we did or something the world wouldn't upgrade to 1.17 correctly.

Backup
Because we didn't really keep backups since we don't really have a lot of storage for the server, the latest backup we had was from April 8th, 2021. This backup was applied on June 20th 2021. So basically what the world was like back in April is what is it now. All player data wasn't lost so your ender chest data and everything is up-to date. But the world had to be reverted. The Nether or the End wasn't affected by this.