For the last two weeks the same weekly back-up has failed, with similar but slightly different failure messages:
Failed to open /home/USER/.backup/EXAMPLE.net_mail_users.webmintmp.4198 : No such file or directory at /usr/libexec/webmin/web-lib-funcs.pl line 1445, <readout12> line 1.
Failed to open /home/USER/.backup/EXAMPLE.net_mysql for writing : No such file or directory
I didn't seek support after last week's error in case this week's back-up worked, but it failed again.
I vaguely recall a similar error being the result of the user's quota being close to max, but this user is nowhere near his quota limit.
Where can I look for more information on why this might be happening?