RE2 shares naming conventions with other RE Engine games, but its app-specific userdata directory identifies the title. Never move win64_save records between games because the folder name looks the same.
For this PC reference, the documented storage is Windows: <Steam-folder>userdata<account-id>883710remotewin64_save. The known file or folder pattern is Capcom win64_save records for the Steam release. Resident Evil 2 stores its standard Steam PC save set in the app-specific userdata remote directory. The whole win64_save folder is safer to preserve than one numbered data file.
Backup guidance: Close Resident Evil 2 (2019), let the launcher finish any synchronization, then copy the complete documented save directory to a dated folder outside the live path. Preserve companion files rather than selecting only the newest-looking record. Steam Cloud can synchronize the remote directory; exit the game and allow Steam to finish before backing up or replacing it. Launcher and cloud context matters because The active Steam installation determines which local profile and cloud copy can overwrite the save. Identify the storefront and account before restoring files.
Compatibility and recovery should stay conservative. Treat saves as version-, storefront-, account-, and mod-sensitive unless the game or a separately verified migration workflow proves otherwise. A similar filename or extension is not evidence that two releases are interchangeable. If the expected progress is not visible, If progress is missing after a restore, confirm the active Windows account, storefront/profile, cloud state, and exact directory first. Restore the untouched backup before experimenting with individual files or older autosaves. SaveEditor.com only labels a game-specific editor as available when a separate linked Tool has a verified operational runtime; this reference page by itself is not an editor claim.