I would go for the export feature!
The big downside to making a backup is that it could only be restored on the same type device, with exact same RouterOS version.
When creating an export (rsc file) you could alter fhe file if needed and load it on practical any replacement device when needed.
[EDIT]
I have put together this script a while back and it integrates the date and device's identity.
#************************************************************************************************
# Parameters
#************************************************************************************************
# First get the identity for the Export file name
:local ConfigExportName [/system identity get name]
# get current date in format mm/DD/YYYY
:local date [ /system clock get date ]
# convert to YYYYMMDD
:local months ("jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec");
:local month [ :pick $date 0 3 ]; :local day [ :pick $date 4 6 ]; :local year [ :pick $date 7 11 ];
:local mm ([ :find $months $month -1 ] + 1);
:if ($mm < 10) do={ :set month ("0" . $mm); } else={ :set month $mm; }
:set date ($year . "-" . $month . "-" . $day);
:set ConfigExportName ($ConfigExportName . "_" . $date);
:put $ConfigExportName
/export file=$ConfigExportName
:log info ("$ConfigExportName created succesfully!");
Alter it with info from the previous posts and it will save to SD card.
PS.
Adding the compact parameter is not needed anymore since RouterOS 6, it does compact by default.
