I was trying to back up my $HOME at Ubuntu by copying the home directory to a SSH server using scp.
But I found that the copy operation soon fell into some endless cycle, repeatedly copying some files. I found some of these files were in my dropbox directory under $HOME, and I was not able to check if there were files in other directories. During that backup, I only had local network connection and not internet connection to connect to dropbox server.
I was wondering if someone happens to know what is happening? Copying which directories under $HOME may cause endless cyclic operations? What non-user created directories are worth backup?