[2020] Offline Mode. Building my base for two weeks. Building decay disabled. All disappeared anyway

Hi @almcfly, welcome to the forums, we’ve moved this post to the correct section as it’s a bug report.

Could you please let us know if you verified your Event Log to see if there were any messages related to building decay or stability?

Additionally, if you have PS Plus, you may try and check your cloud saves to see if there’s any recent save you can download to get your base back.

In the future, we’d advise ensuring that you save and backup your singleplayer data frequently to the cloud or to an external storage device, to mitigate losses that may occur due to save database corruption or in-game issues.