- Backup all installers with registration on rewritable DVD's. (weekly)
- Backup all installers with registration info on my secondary HD. (weekly)
- Backup my main HD as an image on the secondary HD. (weekly)
- Clone the secondary HD on a different storage HD. (monthly)
I keep a folder named "Installers" on my system drive that contains copies of all of the appropriate disk image or .exe files (or whatever else the actual installer is as it's delivered) along with screenshots or .pdf files of any license code or password info I need to authorize any non-iLok plugins.
Since I keep that along with all of the actual plug-ins on my system drive, it gets backed up normally.