Do you know you can Backup your Builds? after you saved it in My Library you go into your Tray Folder in The Sims 4 Folder in Electronic Arts which should be in Documents and there will be 8 files for your Build, it's best to go there straight after you saved it to My Library and then make sure to save your game but make sure to keep making new saves with Save As every time you play before you quit your game for the day because Saves tend to disintegrate and corrupt pretty quickly it's been a problem since TS3 then delete the old ones. If you haven't added anything else to My Library then find the more recent modified files in the Tray Folder, then use Winrar to zip them up, to put your Build back into your game just put the files back into the Tray Folder. These are the files you're looking for in this picture...
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