Even though Square runs its infrastructure well, it's prudent for
the end user of any crucial service to have their own backup. I'd
guess that such a backup would be in the form of a spreadsheet
or XTML file. In my account, I haven't yet found an option to
create such a backup of Square.
From my Square account, is there a way for me to back up
my Square store, with all settings, variations, options, prices?
If it can't be done from Square, are there any third-party services
that can back up my Square content?
There's not a way to do this. However, you can export your Item library and Customer directory as a spreadsheet and safely file it or you records.
Square Community