Server Won’t Save

[Journee]

When I logged onto my server today, most of the stuff that my friends and I did yesterday was not saved. This morning, I went on and did things but when I came back again, it was not saved. Things seem to save if you leave the server and go back on in a short amount of time, but it seems that if the server goes into hibernation, none of the previous work is saved. I also do not have or have access to any save commands, despite me being the server owner.

[Residents]

have you opped yourself?

[Journee]

How do I op myself? 

[victorfgdgfd]

/op (your name) but it did not work for me

 

[Journee]

Figured it out- turn on the /JoinOp plugin and before you leave the world, do the command /save-all. Should save the world. Only use this for more private small servers, though.