Checkpoint64 has a preset for Elden Ring: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Elden Ring:
Elden Ring
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Save file location
Windows:
%APPDATA%\EldenRing -
Backup guide
Elden Ring's Steam Cloud sync has a well-documented history of corrupting saves, and there's no official way to undo New Game+. Checkpoint64 keeps every version of your .sl2 so a bad sync or a big commitment is one click from undone. Free download.
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Sharing with friends
How to share your Elden Ring world with friends, from playing live to taking turns when the host is offline.