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I am going to replace the battery in my wife’s Ipadmini2. Is it recommended to backup data prior to the replacement? What is the best and most efficient method of performing a backup on this device? Does this unit have nonvolatile memory (hard drive)? Where does the OS reside? Thanks!

It is important to do a backup before any repair on a device. You have two options, both work just as well:

  1. Using iTunes, it does not back up (but doesn’t require an internet connection to back up or restore): Content from the iTunes and App Stores, or PDFs downloaded directly to iBooks (click transfer purchases to do so). Content synced from iTunes, like imported MP3s or CDs, videos, books, and photos. Photos already stored in the cloud, like My Photo Stream, and iCloud Photo Library. Touch ID settings Apple Pay information and settings Activity, Health, and Keychain data (use an encrypted backup with a password to do this).
  2. Using iCloud, it does not back up (but requires an internet connection to back up and restore): Data that’s already stored in iCloud, like Contacts, Calendars, Notes, My Photo Stream, and iCloud Photo Library. Data stored in other cloud services, like Gmail and Exchange mail. Apple Pay information and settings Touch ID settings iCloud Music Library and App Store content (you can just tap to download all your apps again).
  • This unit has Storage which is non-volatile memory.

always back up any device before making modifications.

So, im ded and yeah idk

So you say to back up all your stuff and information crap but what if you have too many things on it but not 100% saved as you have too much??