I have a Time Machine NAS on a Raspberry Pi 4B with samba. Can you please explain to me how does Time Machine encrypt backups on NAS disk? I'm trying to figure out if encryption and decryption are happening on the client or on the server, because I have two options, but I'm not sure which is better.
Encrypted EXT4 disk (aes-adiantum-plain64) on server with plain backup
Encrypted EXT4 disk (aes-adiantum-plain64) on server with encrypt backup
Is there a difference in speed? The used disk is an external SSD with an USB 3.0 port.