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Recently, I made a TWRP Recovery Nandroid backup of my current ROM, and I had just taken some personal pictures. In the backup, it included the /data partition. When I went to restore it, I opened the Photos app, and nothing was there. I checked the file system, and the camera and DCIM folders are empty. Is there any way to get the pictures back?
I am on HTC One M8 GPe Android 5.1.
That is the way nandroid works. Its NOT some bug.
Yes, it does include /data partition but your data is stored in /data/media/0 which it skips during backup as this would lead it to backup everything inside internal memory increasing backup size significantly.
In other simple words, nandroid backup's /data option includes only apps and their data, not your personal data on internal or external sd.
As for restore, there are a bunch of apps that claim to be able to recover deleted/formatted data such as Undelete (you need to be Rooted for this one) but I have never personally tried one so can't say about the performance. So you will have to test those yourself.
Hope this helps.
/data/media/0 corresponds to the "internal SD card", so it somehow even makes sense (Nandroid doesn't backup the external card either). So one must be aware to backup SD cards separately it seems?