Using multiple iPads
Can I backup multiple iPads (different app and data loads) to the same Mac?
iPad mini (6th generation)
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There are no practical restrictions to the number of devices that can be backed-up to a Mac (using iTunes or Finder - as appropriate for the installed version of macOS) - or to iCloud. Each device backup is unique and independent - being internally identified by a backed-up device’s unique identifiers.
How to back up your iPhone, iPad, and iPod touch - Apple Support
