For consistency, filenames listed in SyncBack, e.g. in the File & Folder Selection window, are sorted using the same sorting method as Windows Explorer. Digits in filenames are considered as numerical content rather than text. This is not case-sensitive. For example:
2string
3string
20string
st2ring
st3ring
st20ring
string2
string3
string20
If filenames were sorted alphabetically then the above example would be sorted like this:
20string
2string
3string
st20ring
st2ring
st3ring
string2
string20
string3