I have read some question, that ask advice how to
rsync sparse files efficiently mentioning the files
/var/log/faillog. Indeed I myself have stumpled over those files being an "issue" as their being backup via rsync turns them to become "unsparse".
What I hence wonder is, what is the need/backgrounding motivation to have those files as sparse, huge files (in my case it was 1.1TB)?
Also in relationship to this a follow up: Since I was assuming them to be logfiles I do not care about excesively I truncated those files, did I corrupt anything with truncating those files ?