Have suggestions for a "roll your own file server"?

[Bruce Labitt]

fstab updated.  Just needed to use UUID=, not PARTUUID.  I do notice 
significantly long boot times now, guess it takes a while to get the 
RAID1 up.  Used to take 5 seconds to be available to ssh into, now takes 
about 45 seconds to a minute.

I think I'd like the server to initiate the backup.  So, first, I think 
I should set up ssh keys.  So the client/server (who's on first!) 
confusion rears it's ugly head.  For the server (the storage center) to 
contact the client (one of several laptops), I need to use the client's 
public key?  So I need to create the client's key pair?  Once I have the 
client's public key I use the ssh-copy-id command from the client to the 
server?

Now if I want no passwords sent what do I do?  (Just keys).  I didn't 
quite understand the example on 
https://www.howtogeek.com/424510/how-to-create-and-install-ssh-keys-from-the-linux-shell/ 
It seems one can have the passphrase last a session, how to get it to 
remember to use the clients' keys in "perpetuity"?  If there's a 
problem, how to revoke the keys?

Have some questions on rsync --backup option, is there a way to have 
like a rotating backup, say a weeks worth?  I don't understand the 
difference between --backup and just using -avr, what is the advantage 
of --backup?  The rsync man file was not clear to me (today).

Thanks

Sorry, had to truncate the message - gnhlug server complained about it 
being over 50KB