NO!! Do NOT patch up @LadybugLeslie! That is the biggest headache ever and you want to avoid it. It makes you play on-line and you have to always allow Origin to update. I could be wrong though as I didn't patch up!
If you are playing on-line and trying for badges then those dynamic challenges need to be copied over too.
If you don't want those saves, then delete the .backups too. If you want to try and save those saves, then delete the .backup extension off the end and see if they'll load for you. If not, you can try deleting the .nhd file out and copying in a .nhd file a file with the same neighborhood.