TERRA-605-04Live
Kept as long as you say
Per kind of document: forever, a year, 90 or 30 days - or, for a letter's attachments, only the text read out of them. Each file is stored once, however many letters carry it.
Also inside TERRA-605 BACKUP
The rest of BACKUP.
TERRA-605-01Live
A nightly copy
A plain database dump every night, written somewhere the app can write to but never read from or delete.
TERRA-605 BACKUP
TERRA-605-02Live
Five weeks, two regions
Restore to any second of the last 35 days, from a copy kept in another region.
TERRA-605 BACKUP
TERRA-605-03Live
Documents too
Attachments, papers and bills are copied to the second region as they arrive. A deleted file stays recoverable for 90 days, so a restored database finds every file it names.
TERRA-605 BACKUP