COMPATIBLE DEVICES (2014-02-09)
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Most likely all Sony Xperia models up till now are compatible. Sony Ericsson Xperia models however are NOT compatible 
and will never be. The following devices are confirmed being compatible with Backup TA by device owners. When your 
device is not in the list but is compatible, please let me know by sending a mail to devshaft@gmail.com. Thank you.

Confirmed: 
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Sony Xperia Z1 Compact
Sony Xperia Z1
Sony Xperia Z Ultra
Sony Xperia Z
Sony Xperia ZL
Sony Xperia ZQ
Sony Xperia ZR
Sony Xperia ION
Sony Xperia S
Sony Xperia SL
Sony Xperia SP
Sony Xperia Acro S
Sony Xperia T
Sony Xperia TL
Sony Xperia TX
Sony Xperia M
Sony Xperia V
Sony Xperia P
Sony Xperia L
Sony Xperia U
Sony Xperia Go
Sony Xperia Sola
Sony Xperia Miro
Sony Xperia Tipo
Sony Xperia J
Sony Xperia E
Sony Xperia Tablet Z

Most likely: 
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All Sony Xperia models

Not compatible: 
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All Sony Ericsson Xperia models