Mobile Backup Basics
Phones and tablets generally need a different backup approach than a computer. Here's the general concepts worth understanding.
Photos & Videos
The largest and most commonly backed-up category from a mobile device, since these files are usually irreplaceable if lost.
Contacts
Contact lists are commonly included in mobile backup apps, since manually re-entering contacts is tedious.
App-Specific Data
Data inside individual apps (like messaging history) is often handled separately by each app's own backup system rather than a general-purpose backup app.
Mobile backup vs. your phone's built-in cloud sync
Phones generally include a built-in backup or sync feature from the operating system maker (like automatic photo backup) separate from any third-party backup app. A third-party mobile backup app might consolidate mobile backups alongside computer backups in one account, which can be more convenient if you're already using that provider for other devices — but it's not the only way to protect mobile data.
This is general educational information, not app-specific setup instructions. Mobile OS permissions and background-app rules can affect how reliably automatic mobile backup runs — check your specific app's settings.