Mine is Local Send which is a FOSS alternative similar to air drop that works across a variety of devices.
Vorta for Borg Backup - for linux and MacOS. You use it remotely but I use it for local backup because a) its encrypted b) its Borg so awesome and c) easy to use. I just pointed it at my home directory, told it where to place the encrypted backups and how often to make them.
Iβve had to recover files twice and recovery is just as easy as set up.
And something like this can be used as the docker server to hold the repository