Microsoft has released build 17758 of the forthcoming Windows 10 update for the Redstone 5 branch.
The latest preview includes several bug fixes but also brings a range of new controls to Storage Sense, Microsoft's smart storage tool introduced in last April's Creator's Update that will at some point replace the legacy Disk Cleaner utility.
This update to Storage Sense aims to help users of OneDrive Files on Demand, a feature for working with lots of data stored in the cloud from a storage-constrained device.
Files on Demand avoids using local disk space by making the files available online-only from OneDrive, but still searchable via File Explorer as if they were locally available. However, once users open an online-only file to work on, it's downloaded from OneDrive and takes up disk space unless it gets reset as online-only.
Storage Sense can now target older, unused, cloud files that have been made locally available and make them online-only. This builds on existing Storage Sense features that delete leftover temporary files and empty the Recycle Bin.
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One purpose of the new features is to free up just enough space for Windows to run smoothly. If a file hasn't been used in the last 30 days it will be eligible for "dehydration", where the file is moved to Microsoft's cloud, leaving only a placeholder on the device so they're still visible.
This feature can be enabled by going to the Settings app and navigating to System and Storage.
Microsoft has also added new controls to select how frequently to run Storage Sense for Files on Demand files that have become locally available. You can now choose to run it every day, every week, once a month or just to automatically run only when there's low free storage space.
If Storage Sense is set to only run when it detects low storage space, it will clean out temporary files, cache files, device driver packages, and a range of other files. And to clear up more space, Storage Sense can be set to delete older files in the Downloads folder.
Users can also set it to make Files on Demand content available online-only after 30 days or 14 days, as well as set select files to be always available offline.
Microsoft notes that the Disk Cleanup utility, cleanmgr.exe, is being deprecated, though it is retaining the feature for compatibility reasons.
Otherwise, build 17758 irons out a number of bugs ahead of next month's expected release of the October 2018 Update.
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