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General info about creating a backup to the microSD card can be found in the Helix Stadium Manual here: https://manuals.line6.com/en/helix-stadium/live/helix-stadium-maintenance What is the Minimum and Maximum capacity of the microSD card for Stadium? Minimum size 32GB Maximum 512GB verified, larger cards are under investigation. Needs to be formatted on the Stadium itself to create the right partitions. HC and XC compatible Are SDXC cards supported? Yes. Will work the same as a regular Micro SD. Minimum capacity of 32 GB. Maximum 512GB has been verified. U1 Speed Class (or higher) is recommended in the manual. The SD card needs to be formatted through the Helix Stadium maintenance mode since it creates its own partitions. Which file formats are supported? The partitions it creates are exFAT (Stadium) and FAT32 (Looper). This is done during the formatting process on the Stadium hardware in Maintenance mode. For Song view: song files loaded need to be .WAV files. Are there any file size restrictions, such as a 4GB limit per file? There is no limit, but if the SD card no longer offers enough storage, an alert will be presented. The user can then choose to delete certain files, OR use another SD card. How do you enter the Maintenance Mode on Helix Stadium? Turn the Helix Stadium OFF and then while powering ON hold down the HOME and SONG VIEW buttons for about 10 seconds, or until the screen turns on. Then you'll see the screen boot into the maintenance window with options on the bottom of the screen.