did you check if your save folder was there? sometimes all you need is to re-copy the serverconfig.xml file then restart and it will rebuild your world.
By default the server install will reload the navesgane and your files should also be there but the serverconfig will get overwritten. just copy a copy of it for next time it updates the version.
You can use ftp to backup your files at any time. I use WinSCP for my ftp.
I tried that and it did not load the save. I'm thinking maybe it is because we use the RWG instead of Navesgame. But we like the randomness of the RWG maps. I don't have much changed in the configs. Just the amount of points per level & the # of days between bloodmoons. The crew has decided they'd rather just revert back to 18.4 until A19 is more usable. They would rather do that than start over at least once a week.