When you connect via FTP to the database server, you see multiple folders with the same timestamp and they are all empty or old files are missing.
Files three months and older are archived and compressed per Blackbaud's Data Retention Policy. Three months after this, the archive is deleted. The script that archives or removes these files generally runs once a week, normally on Saturdays.
If you wish to have a file restored before it is permanently deleted at the six-month mark, please create a support request at www.blackbaud.com/support providing the details of the issue and referencing this solution.