backintime ends with error 6144

You've to divide it by 256 (don't ask me why, I've no clue) so you will get rsync return code 24:
> 24 Partial transfer due to vanished source files

One or more files changed before rsync could transfer them. Rsync will transfer them next time again. You can browse the snapshot log to see which files where effected. But normally you don't need to worry about it.

Only if those files is a db (MySQL, Postgres, ...) you should rather exclude the files, create a db dump with custom user-callback script and backup only the dump.

OK, thank you. You were right, the next rsync ends with error 0.

Don't worry, I don't backup any db's "native". Instead I create a backup with the db itself and backup the file that the db backup gives out.

Hi, I've hit this error a few times too recently. Is there a specific string that I can search the logs for to find which file disappeared? I'm finding it difficult to look manually.

I'm not 100% sure but I think you can search for 'vanished'

Thanks Germar, I think that's correct.

$ fgrep vanished takesnapshot_.log
[I] Take snapshot (rsync: directory has vanished: "/usr/lib/libindicator")
[I] Take snapshot (rsync: rsync warning: some files vanished before they could be transferred (code 24) at main.c(1165) [sender=3.1.0])