For first 100 users, I always suggest finding people, who are searching for answer - instead of asking them if they are interested.
Mostly people who have faced the disaster in last few days ( Using Twitter search ), or people who have recently attended any webinar or event about Data Security or similar ( Using Linkedin events ).
Or people who are even reacting on such posts about someone losing all or their data because of no backup. Like, comment or anything.
Might need manual hunt, but super high chances of conversion always 🙂