WPMU DEV - Snapshot Pro 4.21.1

Bug: Minor improvements in code and copy
Improvement: Replaced hero image with new product logo

Bug: Resolved an issue with region being not set correctly
Improvement: Minor user interface enhancements

Bug: OneDrive authentication issue
Bug: Issue with missing database files on some sites
Improvement: Enhanced incremental backup engine robustness
Improvement: Minor UI tweaks
Improvement: Security enhancements
Improvement: Improved white-label support