I have recently started using rclone together with Backblaze B2 and also Jottacloud.
Both remotes seem to suffer from a problem when using a crypt remote on top of them.
My storage server has 32GB of ECC RAM and the problem seems to occur when I try to upload a file where the size goes above the amount of system memory.
I am quite sure that the problem is the encryption process that runs under /tmp and at some point the server runs out of memory and the processing is aborted and retried.
The most extreme example is a 120GB image of my laptop. If I run it directly to the remote, without the crypt on top, it runs fine after using a couple of minutes for the checksum calculation.
Is there a way to force rclone to use a specific location for storing temporary files?