Safepoint on USB

This problem, USB drive being renamed and Safepoint failing to find a prior backup, has been discussed in the past in other threads. You can find them by doing a forum search via the search button at the top right (magnifying glass icon). See this post for one possible workaround:

https://community.wd.com/t/new-release-firmware-release-04-04-02-105-1-27-2016/148441/69