The H-Factor

If you choose to install the new databases for
HydraLIST and HydraCALC – here is where the existing files get backed up to:

Note the two Backup folders, one under each program.

Also note the folders named Standard Data under each. Regardless
of whether or not you choose to replace the data, a copy of the new data
ALWAYS gets put in these folders. That way you can always copy
over the new data yourself.