This is the 9418th most frequent Japanese word.
移さ
"移さ" is the stem form of the verb "移す," meaning "to transfer, move, or shift."
In this sentence, '移した' is used to indicate moving an object (the book) from one location to another.
本を机の反対側に移した。
I moved the book to the opposite side of the desk.
Here, '移そう' is used metaphorically to imply transferring responsibility from one person to another.
彼は責任を他人に移そうとしている。
He is trying to shift the responsibility to someone else.
In this usage, '移した' describes transferring or moving intangible items, specifically data.