Same phone, I had the same issues during EA ( reboot - reported here and problems on backup restore).
For reboot, no solution found other than reflash (I’m still on 4.2 for this reason).
For backup restore: see here what worked for me (specifically notes and contacts). My backup was taken with the “legacy” nemo, because I had only applied OTA updates since the 1st Sailfish X version on Xperia X. Recent OS images switched to “defaultuser” (/home/defaultuser instead of /home/nemo) and the backup seems to include some absolute paths referring to “nemo”.
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