Checkpoint64 has a preset for Skyrim Special Edition: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Skyrim Special Edition:
Skyrim Special Edition
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Save file location
Windows:
%USERPROFILE%\Documents\My Games\Skyrim Special Edition\Saves -
Backup guide
Skyrim Special Edition saves live in one folder and one bad mod change can brick them. Checkpoint64 keeps every version of your .ess saves so a broken load order is one click from undone. Free download.