There's an explanation (of sorts) in the forum:

"After a server upgrade went not exactly as planned, I had to recover from the last backup, which alas was made 5 days ago.
Truly sorry for not making an extra backup before starting the upgrade. For some reason I thought that backups on DigitalOcean were daily whereas in fact they were weekly."


WSP wrote:

This is just to report that the CintaNotes site is back online this
morning, but with no explanation for its prolonged absence.

Bill