Comment by skydhash

> /tmp must be world-writable and for multi-user or multi-tenant systems it becomes a security hole. Storing temporary files in the current user's home directory (or a subdirectory thereof) makes sense.

It makes sense when it's a user option. If /tmp isn't an option due to security concerns, then use $CWD by default. I can always alter the config to some other location if I do not like it. With the amount of programs that litter $HOME, especially with caches, you have to whitelist directories when backing it up. With a naive rsync, you'll find half your transfer is junk.