The phrase "a sort of diary" is correct and usable in written English.
It can be used to describe a journal or record that captures thoughts, experiences, or events in a somewhat informal or varied manner.
Example: "This blog serves as a sort of diary, documenting my travels and personal reflections along the way."
Alternatives: "a type of journal" or "a kind of log".
"The films can be understood as a sort of diary or daily newspaper of one's self," Mr. Kentridge said, noting that the cryptic phrases in "Medicine Chest" had been lifted from actual headlines.
The company's pick: a spot that features a 68-year-old man born in India and living in Maine, who "didn't know what technology meant" growing up, but now loves to shoot video as a sort of diary.
But here, I had at my disposal Fatima Elayoubi's book, a sort of diary that she kept for her entire work life and time as an immigrant in France.
Aside from the phone pics, your blog has become a sort of diary in which you document your transition from self-diagnosed "frumptress" to New York housewife-about-town.
Keep a sort of diary, or a log, for just a day or two, record the times of day and catch the fluid, measure and record the amount that you urinate, and record each time you have an accidental "leak" of urine each day.
Twitter is a sort of public diary; figurative scraps of paper.
Mr. DeGaetano's own Sonata Number 1, subtitled "Summer of '85," proved a sort of musical diary - personal, deeply felt and often affecting, if not particularly well-made.
Mr. Teachout's research for "Pops" included listening to a sort of audio diary Armstrong kept over the years, hundreds of tapes he made recording his thoughts.
Happily, the psychiatrist who runs the clinic asks him to keep "a sort of audio diary" on a digital recorder, which the garrulous detective names Mildred.
Begun in 1997, the series of Trames, borderline works between solo concerto writing and chamber music, and the series of Traces, conceived for solo instruments and real time processing, constitutes a sort of compositional diary for their author, they form as well an important part of his catalogue.
