Apple churned out iOS 10.3.1 few days back that contained few minor bug fixes. And since there are myriad rumors that there will be a iOS 10.3 jailbreak out soon, it is suggested that you save Ios 10.3 SHSH2 blobs.
There is another reason why you should backup iOS 10.3 blobs – Apple has stopped signing iOS 10.3 for iPhone and other devices so if in case the iOS 10.3 jailbreak is out, you will be able to roll back to 10.3 and get the jailbreak done.
The only working jailbreak at the time of this writing is Yalu jailbreak for the iOS 10.2 and it works only on iPhone 6s, 6s Plus, SE and iPad Pro. The iPhone 7 is not even supported.
But if you have already upgraded to iOS 10.3, we suggest backing up those SHSH2 blobs now in order to avoid remorse later on. The iOS 10.3.1 is already available for download and with the window of 10.3 closed now, you won’t be able to get back to the 10.3 on your iPhone unless you have blobs backed up.
You can save the blobs by using TSSSaver. Go to https://tsssaver.1conan.com, paste your ECID and select your device to save the blobs.