Snapshot Pro deactivated after installation due to php 7 error?

I just bought the Snapshot Pro Plugin because as a designer I wanted a plugin that do a backup/restore of a multisite without any complicated installation etc.

After installation on the networksite my dashboard (which is also new to me) said:
DE-ACTIVATED Snapshot Pro v - Fixed PHP7 split deprecated

I have no clue what this means... and how I can manage a backup :-\
Please... help me :slight_smile: