Accumulation of APK's?
No. This folder is not created by Android.


This is the folder created by the app named Super Backup &amp; Restore. This app is used to backup Contacts, SMS, Call logs, and some user Apps. And to restore to any version of android. 
During backup, it creates a root folder named SMS Contacts Backups, and with sub folders with each category: apks, logs, contacts, sms in the internal memory.
You can remove those folders after restoring.(Note: Also, you need to remove App(Super Backup &amp; Restore), otherwise it again creates folder with same name.)