I just recently got a license for Unraid and I was trying to accomplish a small plugin to backup my server to a storage bucket online. To accomplish this I decided to separate the files I wanted to back up into separate tar archives and send them one at a time. This was to prevent creating one large tar file of all my files and taking up a lot of space on my system.
Anyway I have been running into this problem, I create an archive in /mnt/user/tempdir but every file that I append to this archive will not be added. To recreate this issue do this: