I has a WRAP board with Zero Shell (is a fine software) is possible it syslog´s the all 6/12/24 hours in a log file on a server (e.g. ftp server in the Internet or local on a NAS (ftp server)) to SAVE.
Zeroshell is to serve with me as radius and Syslogserver, for A big Hotspot therefore is it necessarily the Log´s to be stored,
No, at present it isn’t possible to save syslog’s data on a ftp server.
With current release you could manually backup the database which contains the syslog’s data. Keep in mind that the compact flash image uses ext3 filesystem by default which has journaling feature and hence it is very safe to use and it is not easy to corrupt it.