For some reason, I am not finding the option that would allow me to specify the drive or folder where I want to cache BOINC data. I think I must have found it previously, but it doesn't seem to be in Options > Computing Preferences or Other Options. This is BOINC Manager 7.14.2 x64 on Win10. Thanks.

Option is located in the INSTALLER program. To change storage locations you MUST REINSTALL and use advanced options to specify.

Exit BOINC. Backup your data files/folders first to be safe. Move data to new location. Reinstall using advanced option specify data new location.

All BOINC's data is stored in a single data folder (including subfolders). There is no run-time mechanism for changing this folder location, but it can be set at installation time (which may be where you remember setting it previously). If you set the wrong location during your last installation, proceed as follows.

Locate your current data folder. By default, it will be at C:\ProgramData\BOINC\, but check that it's there. The current location is shown in the BOINC Event Log at startup.

Un-install your current BOINC version. This removes the programs and some settings, but does not remove your existing data.

Locate your BOINC data folder, and move the entire thing - folder, files, subfolders - to your preferred new location.

Re-install BOINC from your original download file (or fetch a new copy if you've deleted it - doesn't matter). Pause on the third installer screen, which will display the current installation paths.

Click on the 'Advanced' button in the lower-right corner. Click on the second 'Change...' button (for Data directory) and pick the new location you moved the data folder to. You can choose a new location for the program files, too, but it's not essential.

Check the other settings if needed, and complete the installation as normal. When you restart BOINC, you should pick up exactly where you left off.

Thanks! That was the answer. I appreciate the help.