Good question.
As a simple answer, yes, you "could" use an iPad for those basic purposes. But you will still need a keyboard & mouse or trackpad and maybe certain adapters to connect external devices. You still need a pc or Mac to format external drive(s) to use with the iPad. There is also a question re: what app(s) are you using for photo management and are they available in iOS.
The bigger question is ... would you be satisfied & happy using it in the long run? Go to an Apple Store and try out an iPad, compare using it vs. a MacBook Pro.
A 13" iPad Pro with 16GB RAM, 1TB storage, 1 USB port and keyboard comes in at $1899
A 14" MacBook Pro with 16GB RAM, 1TB storage, 3 TB/USB ports is $1799, that is, $100 less. Keyboard & trackpad included.
I would vote for the MBPro.