I think you really need to add this option. Or it will just create duplicate backups. And A LOT of them.

Is this what causes:

[AutoSaveWorld] Could not dump RegionFileCache
[04:59:47] [AutoSaveWorld AutoSaveThread/WARN]: java.lang.RuntimeException: Can't find method saveLevel with params length 0
[04:59:47] [AutoSaveWorld AutoSaveThread/WARN]: at autosaveworld.utils.ReflectionUtils.getMethod(ReflectionUtils.java:49)
[04:59:47] [AutoSaveWorld AutoSaveThread/WARN]: at autosaveworld.threads.save.AutoSaveThread.dumpRegionCache(AutoSaveThread.java:165)
[04:59:47] [AutoSaveWorld AutoSaveThread/WARN]: at autosaveworld.threads.save.AutoSaveThread.performSave(AutoSaveThread.java:152)
[04:59:47] [AutoSaveWorld AutoSaveThread/WARN]: at autosaveworld.threads.save.AutoSaveThread.run(AutoSaveThread.java:87)

No

Any updates to this?

No, because there can be activity when there are 0 players online, so that feature is in a low priority list.

My small world is up to 5 GB in storage now because of the redundant backups on empty server.

I'm working in system that will skip backup if there wasn't any players online from last backup