[Edited out]
Emergency funds, reserve funds and float are all back up funds. This is because emergency funds is the backup to your bitcoin investment and should be tampered with last after you have spent your float and reserve funds incase you lose your job. Reserve funds acts as a back up funds to your emergency funds and that's why you don't touch your emergency funds until a real life emergency plays out. Float is the backup to your reserve funds.
It is obvious you can't really differentiate between this three terms and the purpose which they are meant for.It is misleading for you to say that reserve funds is the backup funds for emergency funds and this purely means that you don't know what reserve funds and floats point are.I would shed a little light on the purpose of the terms.
Emergency funds is only meant for one purpose, which is purely for emergency since live is full of uncertainty.The next one is reserve funds, reserve funds is not meant to act as a backup to emergency funds but rather the purpose of reserve funds are funds for specific expenses which is being kept aside and to be used for a particular purpose.
Lastly,the float funds doesn't act as a backup funds for reserve funds,the float is the money that is held temporarily in our account before it is being used up.