Backup and Restore Entire NAS on Bigger HDD

cmelkin 

sounds like you might not have a backup (another 2 bay nas or 2 12TB USB disks for backup at minimum recommended and required to replace the disks in raid0) app backup is lot more complicated as they are in hidden folders (i usually only use readynas as backup units so haven't used anything more then the built in features like snapshot and backup tasks)

you may want to consider a 4-5+ bay nas to give your self a bit of redundancy (3x12TB disks raid5 < x-raid auto) but that is still not a backup thought (does allow online disk replacement or/and replace disks with larger disks) and you wont have to re set up the nas every time you want to add more space or replace a failed disk

or have 2x2 bay nas's or 1 nas and 2 USB external hdd backups

make sure you setup monthly disk scan (say 1st each month) and scrub (7th each month) , make sure the Volume and share folders have checksum enabled when you create them to allow the scrub to be effective at reporting corrupted data (in raid1 or 5/6 it will attempt an auto repair if errors are detected) and setup email notification (recommend not use google as login as its tokens expire,, hotmail/Microsoft does not seem to expire its login tokens, you can add more then 1 email for notification in the list)

if no backup is been used, recommend a 5+ bay nas with 4-5 disks in raid6 to minimise total data loss but not eliminate it (raid6 is still not a backup but significantly safer at replacing disks as you still have 1 disk redundancy when rebuilding and handling 2 disk failures) to use raid 6 leave one disk outside of the unit when you set it up the readynas, once setup turn off x-raid insert the new disk and add parity disk once it starts adding the disk you can turn back on x-raid that will transform into raid6 (or turn off x-raid with all disks inserted and destroy the volume and recreate it as raid 6 then turn x-raid back on) readynas makes this more compacted then it needs to be (it should ask for redundancy amount like it used to on OS5 when 4 or more disks are installed)

raid0 is very risky especially without a backup (very explodey if one disk fails)