Backing Up Data
The available USER memory is limited. When the PSR-2000 was released, there was only 560KB of internal memory available, less than even a floppy disk could hold. That was boosted to about 1.5MB with the PSR-2100, the PSR-3000 and the PSR-900. With the PSR-S models, user memory has expanded regularly. The S910 offere 2.4MB, the S950 holds 6.7MB, and the latest S970 gives you a whopping 13MB.
The Tyros models offered considerably more USER memory. Tyros1, Tyros2, and Tyros3 provided 3.2MB of USER memory. Tyros4 boosted this to 6MB and came with a 250GB hard drive. The Tyros5 has 6.7MB of USER memory and a 500GB hard drive.
You can store information in this USER area of memory and it will remain there, even if your keyboard is turned off. However, turned off does not mean unplugged from the wall outlet. The Internal RAM Memory in the initial PSR2100/2000 was "volatile." Any user-stored data in this memory location such as Songs, Styles, System Setup data, Music Finder Database information, etc. must be backed up to floppy disk, if the unit will be unplugged from an AC outlet for more than a week. If the unit is left unplugged for over a week, the data may be lost.
Anything that you save to USER memory can also be saved to a USB drive or a hard drive. If your model includes a floppy drive, data can be backed up to a floppy disk. It is a good idea to save your USER memory files to a USB drive (or one or more floppies) and use this backup as your primary storage device. The USER memory can be used for creating songs or styles, but once created, move them to a USB (or floppy disk) and free up your limited user memory for additional work. Alternatively, you can put your very favorite external styles in user memory and keep additional favorites available on the USB or floppy disk. This way, when you are playing you have, in addition to the preset styles, all the styles in the user area and the styles on the USB drive (or floppy disk) currently plugged into the keyboard.
The storage capacity of current USB drives is so large that most user can store all the files they want on a USB drive and have them instantly available to their keyboard. However, the contents of that USB drive should also be backed up to your personal computer.