Previous data and apps recover

Restore your IPhone from a backup -

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If you have a backup then you can restore from it. Hope you are aware of the restoring process which will wipe out everything on your device with that of the backup. 

If you are 100% sure that the backup that you are restoring has the data that you are looking for and are ready to wipe out your current data. Else take a current backup and archive it. Then restore.

How to create Multiple Backups for the same device.

1. On iTunes Click on Manage Backups
2. Right Click on a Backup and Click Archive
3. Click Backup Now.
4. You will see a fresh backup will get created See the GIF below