I cannot recommend the Verizon Backup app. It's untrustworthy.
Like many users, I recently allowed the upgrade of 12/18 to be installed. It was a bad experience.
So I got on the phone with Verizon support.
One thing led to another and finally "cold boot" and "total software reload" was suggested.
Before that was done, I was instructed to run Backup to save my contacts.
Did that without apparent error.
Upon restore, many random contacts were missing.
I'm still discovering lost contacts after a month.
Of course, I also had to recreate ALL my email accounts from scratch.
Backups should be usable; they need to give you more than a "warm and fuzzy" feeling.
A Backup that doesn't restore your stuff is worthless.
I don't know what alternatives are out there but I'll not trust the Verizon Backup app.
FWIW