In these two videos, you’ll learn how to completely backup and restore your Facebook account — even to another user account — using Acronis software. This is important in case your account gets hacked, suspended, or content is mistakenly deleted. For those wanting to shut down their Facebook presence, it provides a way to keep your content accessible.
Facebook Account Backup
Facebook Account Restore
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Source: Acronis (19 May 2017)
Iowa City Technology Services 
can I restore a facebook backup done using only facebook if I purchase the Acronis software
I’m not sure. You should check the support page on their website to be sure.