Yes — on Google Play
Google One has a Google Play listing.
App Store
On Google Play
Is Google One on Android?
About Google One
The Google One app lets you back up your phone and manage your Google account storage. • Back up the important things on your phone, like photos, contacts and messages using the 15 GB of storage that comes with a Google account. If you break, lose or upgrade your phone, you can have the peace of mind of knowing the …