The way I intend to handle this is with my keypass password manager since the file database has to be synced manually. The way I handle this is one copy of the database lives on my phone, which is my primary device. Then I copy this database to a flash drive, and then copy it to my laptop. The update process goes something like update the credential on my phone and then a few months later, during my scheduled backup routine, copy the database to the flash drive and then copy the database over to the laptop. So the most I could lose is a few months worth of data instead of all of it. If my phone is ever stolen, I still have a copy of the database on both the flash drive and the laptop, which at most might be a few months out of date, but nothing severe.