thoughts on how to manage data with 256gb

would appreciate thoughts on how manage data...
have imac 250gb of video,photos, music etc on it. growing day. syncing ipad selected photos,music,videos etc.
planning on getting air 256gb photo editing etc, liking portability.
what's best way of moving across videos , photos want onto air , syncing ipad on it?
others do?
many

 

love hear thoughts on well.

 

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