I see no problem with writing in pencil on the back. I do it all the time. It is helpful with press photos that have a caption sheet as it can be upside down or when it is folded over you only see the blank side. Stickers or Post-its are not a good idea on older photos. The adhesive is not archival and older photo paper is porous. Putting a piece of paper in an archival sleeve behind the image is not bad, however the paper can still react with the image.
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'Integrity is what you do when no one is looking'
"The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep”
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