You can save your private keys too just in case.If you have done all this in a secure computer that doesn't have any malware or anything than you are safe.
Honestly, it is pointless saving the private keys... as soon as a new address is generated (basically after the OP receives their first payment), the backup of private keys is out of date. Additionally, exposing private keys is an unnecessary risk if they already have the seed safely backed up/stored away offline.
As Abdussamad said... seed+encrypted wallet file = all you need.