Naming error

could you give me an example? preferably a screenshot (with part of the file name obscured if they are still online)

https://s2.postimg.org/7ib6o00ft/Screen_Shot_2015_12_18_at_12_34_35.png

This is the screenshot

Hi, can you please update this ticket? Thank you!

sorry about that.. new version shows you a link to a log, it shares the backup name, is that truncated as well?

Yes, it is.

is this on a windows server?

I don’t know it is a shared hosting cPanel account.

it’s not a windows host then. can you set up a test installation on the host?

I have 20 other websites on the same cPanel account and each has a wp-clone, all working fine but this one.

in that case, it sounds like a plugin or your theme is hooking onto the sanitize_file_name filter and returning an empty value.
cycle your plugins one by one and do a backup everytime you deactivate a plugin to find out which one is causing it. needless to say, start with ones that are not active on any of the other sites.