Does i will be able to restore version 12 backup in version 13, 14 and 15?

ERPNext
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1

Will i be able to restore frappe & erpnext version 12 backup in version 13.14 or 15 after fresh installing of frappe & erpnext version 13/14/15?
I have done a lot of customization in version 12 self hosted server.

2

Please check this reference: Version 12 uses in future - #3 by NCP