WHY DOES MY BACKUP FROM YESTERDAY HAVE TODAY’S DATE ON IT?
Express has two methods of backing up your database, and each has a similar, but slightly different, file naming convention.
Two backups are created whenever either method is accessed, with these file naming formats:
The Site Abbreviation is up to three characters, and is set up in File -> Site Setup -> Site tab. If nothing is in that field, the Site Abbreviation will be XXX.
Automatic Backup during Overnight Processing:
The day of the week, month, and year are all based on yesterday. This gives you an end-of-day backup and an end-of-month backup that reflect how the information looked at the very end of the day or month for which they are named.
If your site abbreviation is ABC and overnight processing ran the backup at 12:20am on Friday, January 1, 2013, the first file will be called ABC_THU.zip, and the second will be ABC_DEC_2013.zip. Both files will have a modified date of 1/1/13, as this is when the files were created.